@article{JRAM_1884__97_148585,
     author = {M. Blasendorff},
     title = {Ueber optische {Strahlensysteme.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {172--176},
     publisher = {mathdoc},
     volume = {97},
     year = {1884},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1884__97_148585/}
}