@article{MOMA_1951__55_176850,
     author = {Hans Robert M\"uller},
     title = {Die {Bewegungsgeometrie} auf der {Kugel.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {28--42},
     year = {1951},
     volume = {55},
     zbl = {0042.40302},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1951__55_176850/}
}