@article{DE_1983_19_10_a4,
     author = {G. S. Osipenko},
     title = {Integrability of invariant plane fields, separation and partial hyperbolicity},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1687--1693},
     publisher = {mathdoc},
     volume = {19},
     number = {10},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_10_a4/}
}