@article{DE_1985_21_2_a6,
     author = {L. Sili},
     title = {Intermediate stability in the first approximation under certain perturbations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {240--245},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_2_a6/}
}