Voir la notice de l'article provenant de la source Math-Net.Ru
@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/} }
V. I. Bulgakov. The phase portrait of a third-order autonomous system. Differencialʹnye uravneniâ, Tome 24 (1988) no. 10, pp. 1821-1822. http://geodesic.mathdoc.fr/item/DE_1988_24_10_a21/