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@article{DE_1985_21_6_a23, author = {L. I. Zhilevich}, title = {On the existence and location of limit cycles in an autonomous system}, journal = {Differencialʹnye uravneni\^a}, pages = {1079--1081}, publisher = {mathdoc}, volume = {21}, number = {6}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_6_a23/} }
L. I. Zhilevich. On the existence and location of limit cycles in an autonomous system. Differencialʹnye uravneniâ, Tome 21 (1985) no. 6, pp. 1079-1081. http://geodesic.mathdoc.fr/item/DE_1985_21_6_a23/