@article{DE_1978_14_7_a19,
     author = {I. G. Egorov},
     title = {Necessary and sufficient conditions for the stability in the large of the zero solution of a second order autonomous system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1317--1320},
     publisher = {mathdoc},
     volume = {14},
     number = {7},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_7_a19/}
}