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@article{DE_1974_10_11_a24, author = {L. S. Lavrinovich}, title = {A certain class of differential equations with a limit cycle}, journal = {Differencialʹnye uravneni\^a}, pages = {2077--2078}, publisher = {mathdoc}, volume = {10}, number = {11}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1974_10_11_a24/} }
L. S. Lavrinovich. A certain class of differential equations with a limit cycle. Differencialʹnye uravneniâ, Tome 10 (1974) no. 11, pp. 2077-2078. http://geodesic.mathdoc.fr/item/DE_1974_10_11_a24/