@article{MAN_1970__186_161989,
     author = {K. SPALLEK},
     title = {Gl\"attung differenzierbarer {R\"aume.}},
     journal = {Mathematische Annalen},
     pages = {233--248},
     publisher = {mathdoc},
     volume = {186},
     year = {1970},
     url = {http://geodesic.mathdoc.fr/item/MAN_1970__186_161989/}
}