@article{DE_1976_12_7_a2,
     author = {Ya. V. Bykov and N. I. Fomina},
     title = {The singular solutions of nonlinear differential {equations.~II}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1161--1173},
     publisher = {mathdoc},
     volume = {12},
     number = {7},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_7_a2/}
}