@article{DE_1998_34_10_a16,
     author = {P. P. Veresovich},
     title = {Nonautonomous two-dimensional quadratic systems that are equivalent to linear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1420--1422},
     publisher = {mathdoc},
     volume = {34},
     number = {10},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_10_a16/}
}