@article{DE_1980_16_11_a8,
     author = {V. I. Mironenko},
     title = {A method that allows one to determine the initial data of periodic solutions of differential systems and to compare the mappings for a period},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1985--1994},
     year = {1980},
     volume = {16},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_11_a8/}
}