@article{SM_1987_58_2_a1,
     author = {V. L. Popov},
     title = {Contractions of the actions of reductive algebraic groups},
     journal = {Sbornik. Mathematics},
     pages = {311--335},
     publisher = {mathdoc},
     volume = {58},
     number = {2},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1987_58_2_a1/}
}