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@article{DE_1973_9_7_a22, author = {L. P. Sulima}, title = {On the theory of the third order homogeneous equation of degree two}, journal = {Differencialʹnye uravneni\^a}, pages = {1351}, publisher = {mathdoc}, volume = {9}, number = {7}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1973_9_7_a22/} }
L. P. Sulima. On the theory of the third order homogeneous equation of degree two. Differencialʹnye uravneniâ, Tome 9 (1973) no. 7. http://geodesic.mathdoc.fr/item/DE_1973_9_7_a22/