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@article{DE_1975_11_10_a2, author = {V. N. Belykh}, title = {The qualitative investigation of a second order nonautonomous nonlinear equation}, journal = {Differencialʹnye uravneni\^a}, pages = {1738--1753}, publisher = {mathdoc}, volume = {11}, number = {10}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1975_11_10_a2/} }
V. N. Belykh. The qualitative investigation of a second order nonautonomous nonlinear equation. Differencialʹnye uravneniâ, Tome 11 (1975) no. 10, pp. 1738-1753. http://geodesic.mathdoc.fr/item/DE_1975_11_10_a2/