Geodesic
The behavior of the integral surfaces of a homogeneous Pfaffian differential equation in the vicinity of singular rays
Differencialʹnye uravneniâ, Tome 5 (1969) no. 5, pp. 874-879 
M. V. Kozhero. The behavior of the integral surfaces of a homogeneous Pfaffian differential equation in the vicinity of singular rays. Differencialʹnye uravneniâ, Tome 5 (1969) no. 5, pp. 874-879. http://geodesic.mathdoc.fr/item/DE_1969_5_5_a8/
@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},
     year = {1969},
     volume = {5},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_5_a8/}
}
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