@article{DE_1977_13_2_a17,
     author = {G. A. Leonov},
     title = {An analogue of the {Bendixson} criterion for a third order equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {367--368},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_2_a17/}
}