@article{DE_1968_4_8_a0,
     author = {B. P. Demidovich},
     title = {The orbital stability of bounded solutions of an autonomous system. {I,} {II}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1359--1373},
     publisher = {mathdoc},
     volume = {4},
     number = {8},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_8_a0/}
}