@article{MZ_1972__124_171673,
     author = {Klaus Heiner Kamps},
     title = {Kann-Bedingungen und abstrakte {Homotopietheorie.}},
     journal = {Mathematische Zeitschrift},
     pages = {215--236},
     publisher = {mathdoc},
     volume = {124},
     year = {1972},
     zbl = {0223.55020},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__124_171673/}
}