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@article{DAN_1968_181_3_a1, author = {I. M. Gel'fand and D. B. Fuchs}, title = {Classifying spaces for principal bundles with {Hausdorff} bases}, journal = {Doklady Akademii Nauk}, pages = {515--518}, publisher = {mathdoc}, volume = {181}, number = {3}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1968_181_3_a1/} }
I. M. Gel'fand; D. B. Fuchs. Classifying spaces for principal bundles with Hausdorff bases. Doklady Akademii Nauk, Tome 181 (1968) no. 3, pp. 515-518. http://geodesic.mathdoc.fr/item/DAN_1968_181_3_a1/