@article{DE_1977_13_8_a19,
     author = {V. I. Bulgakov},
     title = {The existence of a knotted solution for a third order autonomous system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1507--1508},
     publisher = {mathdoc},
     volume = {13},
     number = {8},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_8_a19/}
}