@article{DE_1969_5_4_a1,
     author = {G. S. Krechetov},
     title = {Certain sufficient conditions for the asymptotic stability of the zero solution of a nonautonomous system of two differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {612--625},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_4_a1/}
}