@article{GDZPPN002397625, title = {Homotopy Equivalences in a Principal Fibre Space.}, journal = {Mathematische Zeitschrift}, volume = {93}, year = {1966}, pages = {380-388}, zbl = {0139.16602}, url = {http://dml.mathdoc.fr/item/GDZPPN002397625} }
Nomura, Yasutoshi. Homotopy Equivalences in a Principal Fibre Space.. Mathematische Zeitschrift, Tome 93 (1966) pp. 380-388. http://gdmltest.u-ga.fr/item/GDZPPN002397625/