@article{MOMA_1979__88_177932,
     author = {H. Heyer},
     title = {Invariante {Markoff-Kerne} und der {Vergleich} von {Translationsexperimenten.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {123--136},
     publisher = {mathdoc},
     volume = {88},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1979__88_177932/}
}