@article{DE_1969_5_5_a8,
     author = {M. V. Kozhero},
     title = {The behavior of the integral surfaces of a homogeneous {Pfaffian} differential equation in the vicinity of singular rays},
     journal = {Differencialʹnye uravneni\^a},
     pages = {874--879},
     publisher = {mathdoc},
     volume = {5},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_5_a8/}
}