@article{DE_1988_24_10_a21,
     author = {V. I. Bulgakov},
     title = {The phase portrait of a third-order autonomous system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1821--1822},
     publisher = {mathdoc},
     volume = {24},
     number = {10},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_10_a21/}
}