@article{MZ_1928__28_168053,
     author = {K., Mayrhofer},
     title = {Topologische {Fragen} der {Differentialgeometrie.} {III}},
     journal = {Mathematische Zeitschrift},
     pages = {728--751},
     publisher = {mathdoc},
     volume = {28},
     year = {1928},
     zbl = {54.0745.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1928__28_168053/}
}