@article{MZ_1968__104_170950,
     author = {Rolf Walter},
     title = {\"Uber {Grenz\"uberg\"ange} in der {Differentialgeometrie.}},
     journal = {Mathematische Zeitschrift},
     pages = {337--348},
     publisher = {mathdoc},
     volume = {104},
     year = {1968},
     zbl = {0157.28503},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__104_170950/}
}