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@article{MS2_1972__30_166237, author = {E. Thomas and L.L. Larmore}, title = {Group {Extensions} and {Principal} {Fibrations.}}, journal = {Mathematica Scandinavica}, pages = {227--248}, publisher = {mathdoc}, volume = {30}, year = {1972}, zbl = {0254.55009}, url = {http://geodesic.mathdoc.fr/item/MS2_1972__30_166237/} }
E. Thomas; L.L. Larmore. Group Extensions and Principal Fibrations.. Mathematica Scandinavica, Tome 30 (1972), pp. 227-248. http://geodesic.mathdoc.fr/item/MS2_1972__30_166237/