@article{DE_1972_8_10_a3,
     author = {N. S. Kolesnikova and N. A. Lukashevich},
     title = {Sufficient conditions for the existence of solutions with stationary critical singular points for first order equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1753--1760},
     publisher = {mathdoc},
     volume = {8},
     number = {10},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_10_a3/}
}