@article{JRAM_1970__245_151064,
     author = {Detlef Laugwitz},
     title = {Die {Messung} von {Kontingenzwinkeln.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {133--142},
     publisher = {mathdoc},
     volume = {245},
     year = {1970},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1970__245_151064/}
}