@article{DE_1990_26_8_a5,
     author = {S. Yu. Pilyugin},
     title = {Chain prolongations in typical dynamical systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1334--1337},
     publisher = {mathdoc},
     volume = {26},
     number = {8},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_8_a5/}
}