@article{DE_1984_20_6_a8,
     author = {A. L. Teptin},
     title = {Nonoscillation of solutions and the sign of the {Green} function},
     journal = {Differencialʹnye uravneni\^a},
     pages = {995--1005},
     publisher = {mathdoc},
     volume = {20},
     number = {6},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_6_a8/}
}