@article{JRAM_1877__82_148315,
     author = {G. Frobenius},
     title = {Ueber das {Pfaffsche} {Problem.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {230--315},
     publisher = {mathdoc},
     volume = {82},
     year = {1877},
     zbl = {09.0249.03},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1877__82_148315/}
}