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@article{MAN_1962__147_160950, author = {H.D. IBISCH}, title = {Homotopie-Operationen relativer {Homotopiegruppen.} {II.}}, journal = {Mathematische Annalen}, pages = {51--68}, publisher = {mathdoc}, volume = {147}, year = {1962}, language = {de}, url = {http://geodesic.mathdoc.fr/item/MAN_1962__147_160950/} }
H.D. IBISCH. Homotopie-Operationen relativer Homotopiegruppen. II.. Mathematische Annalen, Tome 147 (1962), pp. 51-68. http://geodesic.mathdoc.fr/item/MAN_1962__147_160950/