International Journal of Bifurcation and Chaos

Article	Citations
Hopf and Zero-Double Hopf Bifurcations of 5D Hyperjerk Oscillator Network System	81
Global Stability and Hopf Bifurcation for a Stage Structured Model with Competition for Food	66
Author Index Volume 32 (2022)	61
Correlation Sum and Recurrence Determinism of Interval Maps	53
Crises of a Fractional Birhythmic Van der Pol Oscillator Using the Improved Cell Mapping Method	48
Design and Dynamics of Multicavity Hyperchaotic Maps with Cylinder Attractors	44
Construction and Attractor Analysis of Discrete Chaotic Systems Based on Julia Fractal Transformation	43
A Novel 4D Conservative Chaotic System with Hidden Extreme Multistability, Special Multitransient Behaviors, and Offset Boosting Behaviors	42
A Note on the Nonlinear Stability of Equilibrium Points in the Planar Equilateral Restricted Mass-Unequal Four-Body Problem	40
Generalized Hopf Bifurcation of Semilinear FDEs in General Banach Spaces	38
Existence, Number and Stability of Periodic Orbits Induced by Homoclinic Loops in Three-Dimensional Piecewise Linear Systems with an Admissible Saddle-Focus	37
Local and Global Dynamics of a Ratio-Dependent Holling–Tanner Predator–Prey Model with Strong Allee Effect	35
A New Mega-Stable System with a Mosaic Pattern and Its Hamilton Energy Analysis	33
2D Generating Surfaces in a Quartic Hamiltonian System with Three Degrees of Freedom – I	33
Bifurcation and Geometric Singular Perturbation Analysis of a Multi-timescale Pituitary Model	31
Global Hopf Bifurcation of State-Dependent Delay Differential Equations	31
Hopf Bifurcation in Oncolytic Therapeutic Modeling: Viruses as Anti-Tumor Means with Viral Lytic Cycle	31
Dynamic Characteristics Analysis of Gear System with Coupled Thermal-Elasto-Hydrodynamic-Nonlinear Effect	29
Nonlinear Dynamics and Bifurcation Analysis of a Hinged-Clamped Beam Under Parametric and Internal Resonances	28
Higher-Order Complex Periodic Motions in a Nonlinear, Electromagnetically Tuned Mass Damper System	27
Odd and Even Functions in the Design Problem of New Chaotic Attractors	26
Blue-Sky Catastrophic Bifurcations Behind Emergence and Disappearance of Quasiperiodic Rubbing Oscillations in a Piecewise Smooth Rotor–Stator System	24
Dynamic Analysis of the Multichannel Supply Chain Under Carbon Subsidy Policy	24
A Novel Method for Analyzing Global Bifurcation and Global Hysteresis of FGM Truncated Conical Shell Structure	24
Learning Reactive Islands of the Voter97 System	23

Transition of Chimera States and Synchronization in Two-Layer Networks of Coupled Hindmarsh–Rose Neurons	23
Crossing Limit Cycles Bifurcating from Two or Three Period Annuli in Discontinuous Planar Piecewise Linear Hamiltonian Differential Systems with Three Zones	23
Immune–Pathogen Dynamics	23
Stability and Bifurcation Analysis of a Beddington–DeAngelis Prey–Predator Model with Fear Effect, Prey Refuge and Harvesting	23
Joint Optimization–Encryption Model Based on Auto Encoder Neural Network, Variable-Length Dynamic S-Box and New Stream Encryption	22
Torus and Hyperchaos in 3D Lotka–Volterra Map	22
Chance and Chaos in an Adaptive Daisyworld Ecological System	21
Bifurcation and Exact Solutions of a Concatenation Physical Model	21
Nonexistence and Uniqueness of Limit Cycles in a Class of Three-Dimensional Piecewise Linear Differential Systems	21
2D-Generating Surfaces in a Quartic Hamiltonian System with Three Degrees of Freedom – II	20
Emergence of Hidden Strange Nonchaotic Attractors in a Rational Memristive Map	20
Turing–Hopf Bifurcation Coinduced by Diffusion and Delay in Gierer–Meinhardt Systems	19
The Diffusive Lotka–Volterra Competitive Model with Advection Term: Exclusion, Coexistence and Multiplicity	19
Dynamics of a New Delayed Glucose–Insulin Model with Obesity	19
Triple-Coupling Cellular Automata and Their Application to Image Encryption	18
A Review of Lorenz’s Models from 1960 to 2008	18
A Fast Hyperchaotic Image Encryption Scheme	18
Magneto-Aero-Elastic Superharmonic and Subharmonic Resonances, Bifurcations and Chaos of Conductive Spinning Circular Plates	17
Turing–Hopf Bifurcation Analysis of the Sel’kov–Schnakenberg System	17
The Generalization of the Periodic Orbit Dividing Surface for Hamiltonian Systems with Three or More Degrees of Freedom – IV	17
Complicated Boundaries of the Attraction Basin in a Class of Three-Dimensional Polynomial Systems	16
An Effective Cloud Image Management Scheme Based on an n-Dimensional Hyperchaotic Map with Desired Lyapunov Exponents	15
Dynamic Survivability in Nonlinear Oscillation Systems with Attractive–Repulsive Interaction	15
Bifurcation Analysis of an Energy Harvesting System with Fractional Order Damping Driven by Colored Noise	15
Strictly Periodic Points of Cellular Automata with Almost Equicontinuous Points	15
A Two-Dimensional Discrete Memristor Map: Analysis and Implementation	15
Entropic Regression Dynamic Mode Decomposition (ERDMD) Discovers Informative Sparse and Nonuniformly Time Delayed Models	15
Multiple Bifurcations of a Discrete-Time Prey–Predator Model with Mixed Functional Response	15
The Complexity of Investment Spillover from New-Type Agricultural Business Entities to Small-Scale Farmers	15
Bifurcating Solutions and Asymptotics in Logistic Equation with State-Dependent Delays	14
Analyzing the Synergistic Effects of Population and Pollution on Forest Resources: A Mathematical Model	14
A Generalized Beddington Host–Parasitoid Model with an Arbitrary Parasitism Escape Function	14
Memcapacitor-Coupled Chebyshev Hyperchaotic Map	14
Ultra-Chaos in the Motion of Walking Droplet	14
Chaotic Model of Muscle and Joint Interactions Based on CPG for Rehabilitation of Incomplete Spinal Cord Injury Patients	14
Four Novel Dual Discrete Memristor-Coupled Hyperchaotic Maps	14
Effective Pest Control Through Natural Predators: A Dynamical Plant–Pest–Predator Model	14
Investigating the Relationship Between Tumor Cells, Healthy Tissue, and an Active Immune System in a Mathematical Model of Cancer Cell Growth	14
2D Generating Surfaces and Dividing Surfaces in Hamiltonian Systems with Three Degrees of Freedom	13
Torus-Breakdown Near a Heteroclinic Attractor: A Case Study	13
Propagation Effect of Epileptic Seizures in a Coupled Thalamocortical Network	13
Detecting Order and Chaos by the mLE, SALI and GALI Methods in Three-Dimensional Nonlinear Yang–Mills System	13
Stability Switches, Hopf Bifurcation and Chaotic Dynamics in Simple Epidemic Model with State-Dependent Delay	13
On the Absolutely Continuous Invariant Measures for Random Maps	13
Global Attractor in the Positive Quadrant of the Lotka–Volterra System in ℝ2	13
Pure-Attention-Based Multifunction Memristive Neuromorphic Circuit and System	13
Dynamics of Generalized Tangent-Like Maps	13
On the Integrability of the Sprott Cubic Conservative Jerk System	13
Bifurcation Analysis of a Diffusive Two-Species Model with Memory-Based Cross-Diffusions	13
Detecting Correlations in Desynchronized Chaotic Chimera States	12

Analyzing Hippocampal Neural Dynamics Under Acetylcholine Deficiency Related to Alzheimer’s Disease	12
Multiple Time Delays Induced Dynamics of p53 Gene Regulatory Network	12
Deterministic Ratchet Transport of Impurities in Fluids	12
Predator–Prey System: Bachelor Herding of the Prey Imposes Ecological Constraints on Predation	12
Bifurcations, Exact Peakon, Periodic Peakons and Solitary Wave Solutions of the Modified Camassa–Holm Equation	12
Measuring and Locating Zones of Chaos and Irregularity by Application of High Spectral Chaotic Global Variants	12
Arnold Tongue-Like Structures and Coexisting Attractors in the Memristive Muthuswamy–Chua–Ginoux Circuit Model	12
Dynamics of a Within-Host Virus Infection Model with Multiple Pathways: Stability Switch and Global Stability	12
Multi-Moment Multiscale Local Sample Entropy and Its Application to Complex Physiological Time Series	12
Chaotic Multiple-Image Encryption Algorithm Based on Block Scrambling and Dynamic DNA Coding	12
A Color Image Encryption Scheme Based on a Hybrid Cascaded Chaotic System	12
Bifurcation and Path-Following Analysis of Periodic Orbits of a Fermi Oscillator Model	12
Optimal and Poor Synchronizations of Directionally Coupled Phase-Coherent Chaotic Oscillators	11
Dynamics of Alternative States and Basin Transition of a Plant-Volatile-Induced Tritrophic System	11
Bifurcation Solutions to the Templator Model in Chemical Self-Replication	11
Influences of Media-Induced Awareness and Sanitation Practices on Cholera Epidemic: A Study of Bifurcation and Optimal Control	11
Grazing-Induced Dynamics of the Piecewise-Linear Chua’s Circuit	11
A Versatile Image Encryption Scheme Based on Optical Hologram Technology and Chess Rules	11
Stability Analysis and Simulation of a Delayed Dengue Transmission Model with Logistic Growth and Nonlinear Incidence Rate	11
3D Generating Surfaces in a Quartic Hamiltonian System with Three Degrees of Freedom – I	11
Chaotic Path Planning for Mobile Robots Based on the Chen System	11
Abundant Firing Patterns in a Memristive Morris–Lecar Neuron Model	11
Bifurcation Analysis for Two-Species Commensalism (Amensalism) Systems with Distributed Delays	11
Transition and Propagation of Epilepsy in an Improved Epileptor Model Coupled with Astrocyte	11
Period-1 to Period-4 Motions in a 5D Lorenz System	10
Temporally Stochastic Cellular Automata: Classes and Dynamics	10
At Most Five Limit Cycles in a Class of Discontinuous Piecewise Linear Systems with Three Zones	10
Leader Selection and Dynamics Analysis under Leader-Based Collective Bargaining for Buyers’ Alliance	10
Bifurcation Analysis of Brain Connectivity Regulated Neural Oscillations in Schizophrenia	10
Type II Intermittency Route to Hidden Attractor in Modified Lorenz System	10
Spatiotemporal Dynamics of an Intraguild Predation Model with Intraspecies Competition	10
Bifurcation of Limit Cycles by Perturbing Piecewise Linear Hamiltonian Systems with Piecewise Polynomials	10
Dynamics of a Mechanical System with Curve of Equilibria: Cosymmetry and Multistability	10
Analysis of Parameter Space, Bifurcation and Symbolic Dynamics of Evolutionary Strategies on a One-Dimensional Regular Lattice	10
Unraveling Chaos, Transition and Dynamical Complexities in a Generalized Predator–Prey Model with Cooperation-Induced Fear and Gestation Delay	10
Dynamics of a Delayed Predator–Prey Model with Prey Refuge, Allee Effect and Fear Effect	10
Approximating the Splitting Point of the Swarmalator Model	10
Limit Cycles of Continuous Piecewise Differential Systems Formed by Linear and Quadratic Isochronous Centers I	10
Periodicity Analysis of the Logistic Map Over Ring ℤ3n	10
Ultradian Rhythmicity and Chaotic Behaviors in the Integrate-and-Fire Model of a Neuroendocrine System	9
Nontrivial Limit Cycles in a Kind of Piecewise Smooth Generalized Abel Equation	9
An Effective Approach for Constructing a Class of 4D Multicluster Conservative Chaotic Systems without External Excitation	9
The Visual Boundary Recurrence Plot: A Closer Look into the Dynamics of Recurrence Plots	9
A Geometric Numerical Integration with Simple Cell Mapping for Global Analysis of Nonlinear Dynamical Systems	9
Julia Sets and Their Control in a Three-Dimensional Discrete Fractional-Order Financial Model	9
Analysis and Modeling of Nonlinear Effects in Constant-Frequency Peak-Current Control	9
Hopf Bifurcation Analysis of a Nose Landing Gear System of Aircraft	9
Uncovering the Correlation Between Spindle and Ripple Dynamics and Synaptic Connections in a Hippocampal-Thalamic-Cortical Model	9
Hopf Bifurcation and Stability of the Double-Delay Lorenz System	9
Bifurcation of Dust-Acoustic Waves in Suprathermal Polarized Dusty Plasma	9
Modeling the Effect of TV and Social Media Advertisements on the Dynamics of Vector-Borne Disease Malaria	9
Exploring Dynamical Matching and Recrossing on a Mesa Potential Energy Surface	9
Stability and Global Hopf Bifurcation Analysis of a Schistosomiasis Transmission Model with Multi-Delays	9
Bifurcation Analysis of a Planar Piecewise Linear System of Focus–Focus Type	9
Codimension-Two Bifurcations and Bifurcation Controls in a Discrete Biological System with Weak Allee Effect	9
A Novel Chaotic Image Encryption Algorithm Based on Propositional Logic Coding	9
A Class of Two-Dimensional Offset-Boostable Chaotic Systems with Transcendental Functions	9
A Novel Image Encryption Algorithm Based on 2D Self-Coupling Sine Map	8
Planar Rotational Equilibria of Two Nonidentical Microswimmers	8
Dynamic Analysis and Fractional-Order Terminal Sliding Mode Control of a Fractional-Order Buck Converter Operating in Discontinuous Conduction Mode	8
Locally Active Memristor with Variable Parameters and Its Oscillation Circuit	8
Hopf Bifurcation of the Ring Unidirectionally Coupled Toda Oscillators with Distributed Delay	8
Infinitely Many Necklace-Shaped Coexisting Attractors in a Nonautonomous Memcapacitive Oscillator	8
Controlled Quasi-Latitudinal Solutions for Ultra-Fast Spin-Torque Magnetization Switching	8
Homoclinic Bifurcations and Chaotic Dynamics in a Bistable Vibro-Impact SD Oscillator Subject to Gaussian White Noise	8
An Investigation of the Discrete-Time Model Subject to Immigration, Harvesting, and Allee Effect	8
Co-existence of a Period Annulus and a Limit Cycle in a Class of Predator–Prey Models with Group Defense	8
Dimension Reduction of Collective Attention Networks	8
Investigation of Synchronization Control of the Memristive/Resistive-Coupled Neural Network with Noise Effect	8
Nonlinear Dynamic Bifurcation and Chaos Characteristics of Piezoelectric Composite Lattice Sandwich Plates	8
Image Compression–Encryption Algorithm Based on 3D Discrete Chaotic System and Josephus Circle	8
Grazing-Induced Evolutions of Coexisting Orbits in a Vibro-Impact Smooth–Discontinuous Oscillator with a Unilateral Adjustable Rigid Wall	8
Beam Steering and Signal Amplification Through Feedforward Networks. Part I: Transmission	8
Breaking the Symmetry in Queues with Delayed Information	8
Periodic Perturbations of Codimension-Two Bifurcations with a Double Zero Eigenvalue in Symmetrical Dynamical Systems	8
Bifurcations, Exact Peakon, Periodic Peakons and Solitary Wave Solutions of the Cubic Camassa–Holm Type Equation	8
Limit Cycles of Discontinuous Planar Piecewise Systems Formed by Linear Centers and Linear Hamiltonian Systems Without Equilibria Separated by a Nonregular Line	8
Suppressing Homoclinic Chaos for Vibro-Impact Oscillators	8
Maximal Lyapunov Exponent and Smaller Alignment Index Computation Characterization of an Electrodynamic Electromechanical System Powered by Sine, Square and Triangle Waves Electrical Signals	8
Nilpotent Center in a Continuous Piecewise Quadratic Polynomial Hamiltonian Vector Field	8

Memristor-Based Progressive Hierarchical Conformer Architecture for Speech Emotion Recognition	8
An Integrated Reservoir Predictor Based on Spatiotemporal Information Transformation	8
Dynamics of an Age Structured Heroin Transmission Model with Imperfect Vaccination	8
Bifurcation in a New Fractional Model of Cerebral Aneurysm at the Circle of Willis	8
On the Bounds of Lyapunov Exponents for Fractional Differential Systems with an Exponential Kernel	8
Generating Chaos with Saddle-Focus Homoclinic Orbit	7
Classification and Soliton for a Generalized Fourth-Order Dispersive Nonlinear Schrödinger Equation in a Heisenberg Spin Chain	7
Weak Centers and Local Bifurcation of Critical Periods in a Z2-Equivariant Vector Field of Degree 5	7
Limit Cycles on Piecewise Smooth Vector Fields with Coupled Rigid Centers	7
Spectral Signatures of Bifurcations	7
Fuzzy Sampled-Data Stabilization of Hidden Oscillations in a Memristor-Based Dynamical System	7
Singularly Degenerate Heteroclinic Cycles with Nearby Apple-Shape Attractors	7
Efficient Neuromorphic Reservoir Computing Using Optoelectronic Memristors for Multivariate Time Series Classification	7
The Number of Limit Cycles for a Class of Cubic Systems with Multiple Parameters	7
Oscillatory Dynamics Induced by Time Delays in the Quorum Sensing System of Pseudomonas Aeruginosa	7
Dynamics of a Harvested Leslie–Gower Predator–Prey Model with Simplified Holling Type IV Functional Response	7
Codimension-2 Bifurcations in a Quantum Decision Making Model	7
The Exact Bound of the Number of Limit Cycles Bifurcating from the Global Nilpotent Center with a Nonlinear Switching Curve	7
On the Number of Limit Cycles in Two Classes of Polynomial Differential Systems	7
Turing–Hopf Bifurcation and Its Normal Form in a Diffusive Three-Species Food Chain System with Strong Allee Effect	7
Bifurcation Analysis of a Tumour-Immune Model with Nonlinear Killing Rate as State-Dependent Feedback Control	7
Regularization of Planar Piecewise Smooth Systems with a Heteroclinic Loop	7
Compound Chaotic Systems with Composite Attractors	7
Stability and Bifurcation Analysis for Mathematical Model of Acute Inflammatory Response with Time Delay	7
Author Index Volume 31 (2021)	7
A POD Reduced Order Method Applied to an Instability Problem of Rayleigh–Bénard Convection	7
Investigating Distributional Chaos for Operators on Fréchet Spaces	7
The Cusp Bifurcation of a Jerk System	7
Heteroclinic Cycles Generated by Piecewise Affine Systems in ℝn	7
Evaluating the Randomness of Chaotic Binary Sequences Via a Novel Period Detection Algorithm	7
An Efficient Medical Image Encryption Scheme Utilizing Nonuniform Cellular Automaton	6
Bifurcations and Exact Traveling Wave Solutions in the Generalized Sasa–Satsuma Equation	6
Bifurcation Analysis and Spatio-Temporal Patterns of a Prey–Predator Model with Hunting Cooperation	6
The Bifurcations of the Critical Points and the Role of Depth in a Symmetric Caldera Potential Energy Surface	6
Collective Behavior in Neuronal Networks with Electrical and Hybrid Synapses: Frequency Responses of Oscillations	6
Saddle–Node Bifurcation Leading to Survival Mosquitoes	6
Exact Solution of Four-Coupled Nonidentical Kuramoto Oscillators at a Full Phase Locked State	6
An Image Encryption Algorithm Based on an Epidemic Spreading Model	6
Dynamical Phenomena Based on Chaotic Systems Without Equilibria	6
Author Index Volume 34 (2024)	6
Effect of Static Bifurcation on Logical Stochastic Resonance in a Symmetric Bistable System	6
Switching between Dissipative and Conservative Behaviors in a Modified Hyperchaotic System with the Variation of Its Parameter	6
The Influence of Asymmetry on the Dynamics Associated with a Caldera Potential Energy Surface	6
Center Bifurcation in the Lozi Map	6
Dynamics of a DC Motor-Driving Arm with a Circular Periodic Potential and DC/AC Voltage Input	6
Impact of Fear on Searching Efficiency of Prey: A Prey–Predator Model with Weak Allee Effect	6
Analysis on Capacity Sharing with Failed Match Based on the Evolutionary Game Theory	6
Dynamics of a Rotated Orthogonal Gravitational Wedge Billiard	6
Dynamics of Dissipative Systems with Hamiltonian Structures	6
An Infinite Sequence of Bitransitive Sierpiński Carpets for z↦λ(z + 1 z)	6
Dynamic Analysis, Image Encryption Application and FPGA Implementation of a Discrete Memristor-Coupled Neural Network	6
A New Version of Distributional Chaos, Distributional Chaos in a Sequence, and Other Concepts of Chaos	6
A Novel Conservative Chaotic Circuit with a Cubic Root	6
Limit Cycle Bifurcations in a Class of Piecewise Smooth Polynomial Systems	6
Dynamics of a Toxin Producing Plankton-Fish Model with Three-Dimensional Patch and Time Delay	6
Predicting the Emergence of Multistability in a Monoparametric PWL System	6
Hopf Bifurcation Analysis of a Housefly Model with Time Delay	6
Renormalization of the Two-Dimensional Border-Collision Normal Form	6
From 1D Endomorphism to Multidimensional Hénon Map: Persistence of Bifurcation Structure	6
Cryptanalyzing an Image Encryption Scheme Using Synchronization of Memristor Chaotic Systems	6
Monotonicity of Limit Wave Speed in the pgKdV Equation with Nonlinear Terms of Arbitrarily High Degrees	5
A Novel Approach to the Characterization of Stretching and Folding in Pursuit Tracking with Chaotic and Intermittent Behaviors	5
Global Phase Diagrams of Three Point Vortices	5
An Image Encryption Algorithm Based on HNN with Memristor	5
The Extended 16th Hilbert Problem for Discontinuous Piecewise Linear Centers Separated by a Nonregular Line	5
Stability of Equilibrium Prices in a Dynamic Duopoly Bertrand Game with Asymmetric Information and Cluster Spillovers	5
Limit Cycles of the Discontinuous Piecewise Differential Systems Separated by a Nonregular Line and Formed by a Linear Center and a Quadratic One	5
Allee Effect in a Generalist Predator Induces Nonstationary Patterns: A Detailed Study of Target and Spiral Patterns	5
Analysis of a Leslie–Gower Model with Allee Effect on Birth Rate and Saturated Fear Effect	5
Dynamics of a Reaction–Diffusion–Advection System with Nonlinear Boundary Conditions	5
Hopf Bifurcation in a Reaction–Diffusion–Advection Population Model with Distributed Delay	5
Parametric Frequency Analysis of Mathieu–Duffing Equation	5
3D Generating Surfaces in Hamiltonian Systems with Three Degrees of Freedom – I	5
Stability and Hopf Bifurcation Analyses of a Delayed Rumor Spreading Model and Its Discontinuous Control	5
Bifurcations of Nonlinear Waves in the Generalized KdV–mKdV-Like Equation	5
A Lossless Compression and Encryption Method for Remote Sensing Image Using LWT, Rubik’s Cube and 2D-CCM	5
Phase Space Transport in a Symmetric Caldera Potential with Three Index-1 Saddles and No Minima	5
Stochastic Canards in a Modified Leslie–Gower Population Model	5
Stability and Bifurcation Analysis of a Commensal Model with Additive Allee Effect and Nonlinear Growth Rate	5
Bifurcation Dynamics of Periodic Motions in an Impact Duffing Oscillator with Two Boundaries	5
Bifurcations of the GKdV–mKdV-Like System with Medical Applications	5
Comparison of Competition Strategy and Retail Mode of Asymmetric Emission Reduction in Supply Chain Under Cap-and-Trade Regulation	5
Effects of Incorporating Double Time Delays in an Investment Savings-Liquidity Preference Money Supply (IS-LM) Model	5
Backward Bifurcation of an Age-Structured Epidemic Model with Partial Immunity	5
Symmetry and Network Topology in Neuronal Circuits: Complicity of Form and Function	5
Hopf Bifurcation Analysis in a Gierer–Meinhardt Activator–Inhibitor Model	5
Topological Chaos for Differential Inclusions with Multivalued Impulses on Tori	5
Role of Allee Effect, Hunting Cooperation, and Dispersal to Prey–Predator Model	5
Dynamic Analysis in a Plankton Ecosystem Involving Two Delays	5
Steady-State Bifurcation in Previte–Hoffman Model	5
Bounded Kukles Systems of Degree Three	5
Nonlinear Dynamics of an Oscillating Electromechanical System Based on Coil Gun Principle: Theory and Experiment	5
Nonlinear Dynamics and Meshing State Transition Analysis of Spalling Defect Gears with Multi-Lubrication Conditions	5
Chaos and Impact Characteristics Analysis of a Multistage Planetary Gear System Based on the Energy Method	5
Existence of Four-Intersection-Point Limit Cycles with Only Saddles Separated by Two Parallel Straight Lines in Planar Piecewise Linear Systems	5