@article{DE_1973_9_9_a0,
     author = {Ya. V. Bykov and L. Ya. Bykova and E. I. Shevtsov},
     title = {Sufficient conditions for the oscillatoriness of the solutions of nonlinear differential equations with deviating argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1555--1560},
     publisher = {mathdoc},
     volume = {9},
     number = {9},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_9_a0/}
}