@article{DE_1971_7_11_a22,
     author = {A. V. Marinchuk},
     title = {Qualitative investigation in the large of a certain second order system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2107--2110},
     publisher = {mathdoc},
     volume = {7},
     number = {11},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_11_a22/}
}