@article{IM_1970__11_142059,
     author = {D. Arlt},
     title = {Homotopie-Typ hochzusammenh\"angender {?-Manigfaltigkeiten.}},
     journal = {Inventiones mathematicae},
     pages = {308--318},
     publisher = {mathdoc},
     volume = {11},
     year = {1970},
     zbl = {0211.55402},
     url = {http://geodesic.mathdoc.fr/item/IM_1970__11_142059/}
}