@article{AM2_1980__21_182436,
     author = {Walter Benz},
     title = {Der {Satz} von {Liouville} \"uber r\"aumliche orthogonaltreue (winkeltreue) {Abbildungen} f\"ur beliebige {Signatur.}},
     journal = {Aequationes mathematicae},
     pages = {257--282},
     publisher = {mathdoc},
     volume = {21},
     year = {1980},
     zbl = {0458.53006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1980__21_182436/}
}