@article{DE_1986_22_8_a14,
     author = {A. Toraev},
     title = {Oscillation and nonoscillation of the solutions of elliptic equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1424--1435},
     publisher = {mathdoc},
     volume = {22},
     number = {8},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_8_a14/}
}