@article{GDZPPN002053349, title = {Zur Homotopietheorie gefaserter R\"aume.}, journal = {Commentarii mathematici Helvetici}, volume = {14}, year = {1941}, pages = {141-192}, zbl = {0026.09302}, url = {http://dml.mathdoc.fr/item/GDZPPN002053349} }
Eckmann, Beno. Zur Homotopietheorie gefaserter Räume.. Commentarii mathematici Helvetici, Tome 14 (1941) pp. 141-192. http://gdmltest.u-ga.fr/item/GDZPPN002053349/