Geodesic
Nonautonomous two-dimensional quadratic systems that are equivalent to linear systems
Differencialʹnye uravneniâ, Tome 34 (1998) no. 10, pp. 1420-1422 
P. P. Veresovich. Nonautonomous two-dimensional quadratic systems that are equivalent to linear systems. Differencialʹnye uravneniâ, Tome 34 (1998) no. 10, pp. 1420-1422. http://geodesic.mathdoc.fr/item/DE_1998_34_10_a16/
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     author = {P. P. Veresovich},
     title = {Nonautonomous two-dimensional quadratic systems that are equivalent to linear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1420--1422},
     year = {1998},
     volume = {34},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_10_a16/}
}
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