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@article{DE_1973_9_11_a9, author = {L. P. Sulima}, title = {On the theory of the second order differential equation of degree two}, journal = {Differencialʹnye uravneni\^a}, pages = {2010--2019}, publisher = {mathdoc}, volume = {9}, number = {11}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1973_9_11_a9/} }
L. P. Sulima. On the theory of the second order differential equation of degree two. Differencialʹnye uravneniâ, Tome 9 (1973) no. 11, pp. 2010-2019. http://geodesic.mathdoc.fr/item/DE_1973_9_11_a9/