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@article{DE_1985_21_1_a16, author = {A. Toraev}, title = {Criteria for oscillation and nonoscillation for elliptic equations}, journal = {Differencialʹnye uravneni\^a}, pages = {130--140}, publisher = {mathdoc}, volume = {21}, number = {1}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_1_a16/} }
A. Toraev. Criteria for oscillation and nonoscillation for elliptic equations. Differencialʹnye uravneniâ, Tome 21 (1985) no. 1, pp. 130-140. http://geodesic.mathdoc.fr/item/DE_1985_21_1_a16/