@article{DE_1971_7_9_a18,
     author = {I. G. Krosko},
     title = {Detection of stability of periodic flows with the aid of generalized characteristic numbers},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1701--1703},
     publisher = {mathdoc},
     volume = {7},
     number = {9},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_9_a18/}
}