@article{INTG_1975_7_a4,
     author = {S. V. Vedernikov},
     title = {Special morphisms of $G$-spaces},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {49--68},
     publisher = {mathdoc},
     volume = {7},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1975_7_a4/}
}