@article{DE_1982_18_9_a2,
     author = {V. I. Luk'yanov},
     title = {Bifurcations of dynamical systems with {\textquotedblleft}saddle-node{\textquotedblright} separatrix loops},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1493--1506},
     year = {1982},
     volume = {18},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_9_a2/}
}