References
N. N. Bautin and E. A. Leontovich, Methods and Tools for Qualitative Analysis of Dynamical Systems in a Plane [in Russian], 2nd edition, Nauka, Moscow (1990).
Additional information
Novosibirsk. Translated fromSibirskiî Matematicheskiî Zhurnal, Vol. 34, No. 2, pp. 170–172, March–April, 1993.
Translated by I. A. Taîmanov
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Toponogov, V.A. A condition sufficient for nonexistence of a cycle in a two-dimensional system quadratic in one of the variables. Sib Math J 34, 350–352 (1993). https://doi.org/10.1007/BF00970961
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DOI: https://doi.org/10.1007/BF00970961