@article{DE_1990_26_9_a6,
     author = {G. S. Osipenko},
     title = {Testing the transversality condition by the methods of symbolic dynamics},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1528--1536},
     year = {1990},
     volume = {26},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_9_a6/}
}