@article{MOMA_1977__84_177837,
     author = {Karl Jakob Dienst},
     title = {Minkowski-Ebenen mit {Spiegelungen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {197--208},
     year = {1977},
     volume = {84},
     zbl = {0378.50017},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1977__84_177837/}
}