@article{IM2_1975_9_3_a5,
     author = {V. L. Popov},
     title = {Classification of three-dimensional affine algebraic varieties that are quasi-homogeneous with respect to an algebraic group},
     journal = {Izvestiya. Mathematics },
     pages = {535--576},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1975_9_3_a5/}
}