%0 Journal Article %A L. A. Beklemisheva %T Classification of polynomial systems with respect to birational transformations.~I %J Differencialʹnye uravneniâ %D 1978 %P 807-816 %V 14 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1978_14_5_a2/ %G ru %F DE_1978_14_5_a2