@article{MOMA_1979__88_177927,
     author = {Hellmuth Stachel},
     title = {\"Uber zweiparametrige ebene {Bewegungsvorg\"ange.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {45--54},
     publisher = {mathdoc},
     volume = {88},
     year = {1979},
     zbl = {0386.53002},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1979__88_177927/}
}