@article{MZ_1961__75_169932,
     author = {G\"unter Ewald},
     title = {Translationsgruppen in verallgemeinerten dreidimensionalen projektiven {R\"aumen.}},
     journal = {Mathematische Zeitschrift},
     pages = {419--425},
     publisher = {mathdoc},
     volume = {75},
     year = {1961},
     zbl = {0096.15101},
     url = {http://geodesic.mathdoc.fr/item/MZ_1961__75_169932/}
}