Translation to english of Arnold's paper: S. Adjan; V. I. Arnol'd; S. P. Demuškin; Ju. S. Gurevič; S. S. Kemhadze; N. I. Klimov; Ju. V. Linnik; A. V. Malyšev; P. S. Novikov. Eleven Papers on Number Theory, Algebra and Functions of a Complex Variable. Vol. 46. American Mathematical Society Translations Series 2.
Guevara, M.R.; Glass, L. (1982). "Phase locking, period doubling bifurcations and chaos in a mathematical model of a periodically driven oscillator: A theory for the entrainment of biological oscillators and the generation of cardiac dysrhythmias". Journal of Mathematical Biology. 14 (1): 1–23. CiteSeerX10.1.1.476.8649. doi:10.1007/BF02154750. PMID7077182.
Guevara, M.R.; Glass, L. (1982). "Phase locking, period doubling bifurcations and chaos in a mathematical model of a periodically driven oscillator: A theory for the entrainment of biological oscillators and the generation of cardiac dysrhythmias". Journal of Mathematical Biology. 14 (1): 1–23. CiteSeerX10.1.1.476.8649. doi:10.1007/BF02154750. PMID7077182.
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Guevara, M.R.; Glass, L. (1982). "Phase locking, period doubling bifurcations and chaos in a mathematical model of a periodically driven oscillator: A theory for the entrainment of biological oscillators and the generation of cardiac dysrhythmias". Journal of Mathematical Biology. 14 (1): 1–23. CiteSeerX10.1.1.476.8649. doi:10.1007/BF02154750. PMID7077182.