Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1958__70_169771, author = {Karl Heinrich Hofmann}, title = {Topologische {Doppelloops.}}, journal = {Mathematische Zeitschrift}, pages = {213--230}, publisher = {mathdoc}, volume = {70}, year = {1958}, zbl = {0095.02703}, url = {http://geodesic.mathdoc.fr/item/MZ_1958__70_169771/} }
Karl Heinrich Hofmann. Topologische Doppelloops.. Mathematische Zeitschrift, Tome 70 (1958), pp. 213-230. http://geodesic.mathdoc.fr/item/MZ_1958__70_169771/