@article{SM_1975_27_1_a5,
     author = {M. Madirimov},
     title = {On~the extension of equivariant mappings},
     journal = {Sbornik. Mathematics},
     pages = {77--84},
     year = {1975},
     volume = {27},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1975_27_1_a5/}
}