@article{DE_1973_9_12_a16,
     author = {Ya. V. Bykov and E. I. Shevtsov},
     title = {Sufficient conditions for the oscillatory nature of the solutions of nonlinear finite difference equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2241--2244},
     publisher = {mathdoc},
     volume = {9},
     number = {12},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_12_a16/}
}