Geodesic
Bifurcation equations for the existence of periodic solutions of periodic Pfaffian systems
Differencialʹnye uravneniâ, Tome 21 (1985) no. 11, pp. 1857-1867 
È. I. Grudo. Bifurcation equations for the existence of periodic solutions of periodic Pfaffian systems. Differencialʹnye uravneniâ, Tome 21 (1985) no. 11, pp. 1857-1867. http://geodesic.mathdoc.fr/item/DE_1985_21_11_a2/
@article{DE_1985_21_11_a2,
     author = {\`E. I. Grudo},
     title = {Bifurcation equations for the existence of periodic solutions of periodic {Pfaffian} systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1857--1867},
     year = {1985},
     volume = {21},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_11_a2/}
}
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