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<ref>3-1, 3-7,8-1 Strogatz, Steven H. (1994). Nonlinear Dynamics and Chaos. Addison Wesley.</ref>
<ref>3-1, 3-7,8-1 Strogatz, Steven H. (1994). Nonlinear Dynamics and Chaos. Addison Wesley.</ref>
<ref>D. Ludwig, D. D. Jones, C. S. (1978). HollingQualitative Analysis of Insect Outbreak Systems: The Spruce Budworm and Forest. </ref>
<ref>D. Ludwig, D. D. Jones, C. S. (1978). HollingQualitative Analysis of Insect Outbreak Systems: The Spruce Budworm and Forest. </ref>
<ref>[https://en.wikipedia.org/wiki/Saddle-node_bifurcation "Saddle-node bifurcation"], Wikipedia</ref>