Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1965__15_4_a3, author = {Mi\v{s}{\'\i}k, Ladislav}, title = {\"Uber einen {Satz} von {E.} {Hopf}}, journal = {Mathematica slovaca}, pages = {285--295}, publisher = {mathdoc}, volume = {15}, number = {4}, year = {1965}, mrnumber = {0210865}, zbl = {0192.14302}, language = {ge}, url = {http://geodesic.mathdoc.fr/item/MASLO_1965__15_4_a3/} }
Mišík, Ladislav. Über einen Satz von E. Hopf. Mathematica slovaca, Tome 15 (1965) no. 4, pp. 285-295. http://geodesic.mathdoc.fr/item/MASLO_1965__15_4_a3/