@article{DE_1987_23_6_a21,
     author = {A. V. Makhorkin},
     title = {Bifurcation of the periodic solution of a completely integrable {Pfaffian} system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1084--1086},
     publisher = {mathdoc},
     volume = {23},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_6_a21/}
}