Geodesic
On a bifurcation of a non-rough focus of a third-order autonomous system
Differencialʹnye uravneniâ, Tome 32 (1996) no. 12 
V. I. Bulgakov; A. A. Grin'. On a bifurcation of a non-rough focus of a third-order autonomous system. Differencialʹnye uravneniâ, Tome 32 (1996) no. 12. http://geodesic.mathdoc.fr/item/DE_1996_32_12_a16/
@article{DE_1996_32_12_a16,
     author = {V. I. Bulgakov and A. A. Grin'},
     title = {On a bifurcation of a non-rough focus of a third-order autonomous system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1703},
     year = {1996},
     volume = {32},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1996_32_12_a16/}
}
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