@article{MAN_1973__204_162462,
     author = {Otto Gerstner and Ludger Kaup},
     title = {Homotopiegruppen von {Hyperfl\"achenschnitten.}},
     journal = {Mathematische Annalen},
     pages = {105--130},
     publisher = {mathdoc},
     volume = {204},
     year = {1973},
     zbl = {0243.57012},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__204_162462/}
}