%0 Journal Article %A V. L. Popov %T Classification of three-dimensional affine algebraic varieties that are quasi-homogeneous with respect to an algebraic group %J Izvestiya. Mathematics %D 1975 %P 535-576 %V 9 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1975_9_3_a5/ %G en %F IM2_1975_9_3_a5