@article{DE_1995_31_10_a23,
     author = {V. P. Nozdracheva},
     title = {Estimates for periods of cycles generated by a singular cycle with two separatrices},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1764--1765},
     publisher = {mathdoc},
     volume = {31},
     number = {10},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_10_a23/}
}