Geodesic
Multiple merging of separatrices and limit cycles
Differencialʹnye uravneniâ, Tome 17 (1981) no. 4, pp. 732-734 
N. N. Butenina. Multiple merging of separatrices and limit cycles. Differencialʹnye uravneniâ, Tome 17 (1981) no. 4, pp. 732-734. http://geodesic.mathdoc.fr/item/DE_1981_17_4_a17/
@article{DE_1981_17_4_a17,
     author = {N. N. Butenina},
     title = {Multiple merging of separatrices and limit cycles},
     journal = {Differencialʹnye uravneni\^a},
     pages = {732--734},
     year = {1981},
     volume = {17},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_4_a17/}
}
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