@article{DE_1995_31_1_a4,
     author = {I. G. Egorov},
     title = {On the {A{\v\i}zerman} problem for a second-order system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {30--36},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_1_a4/}
}