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@article{DAN_1981_259_6_a6, author = {A. Toraev}, title = {On the oscillation of solutions of higher order equations of elliptic type}, journal = {Doklady Akademii Nauk}, pages = {1309--1311}, publisher = {mathdoc}, volume = {259}, number = {6}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1981_259_6_a6/} }
A. Toraev. On the oscillation of solutions of higher order equations of elliptic type. Doklady Akademii Nauk, Tome 259 (1981) no. 6, pp. 1309-1311. http://geodesic.mathdoc.fr/item/DAN_1981_259_6_a6/