@article{IM2_1973_7_5_a3,
     author = {V. L. Popov},
     title = {Classification of affine algebraic surfaces that are quasihomogeneous with respect to an algebraic group},
     journal = {Izvestiya. Mathematics },
     pages = {1039--1055},
     publisher = {mathdoc},
     volume = {7},
     number = {5},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1973_7_5_a3/}
}