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@article{CMH_1933__5_138600, author = {Anna Fischer}, title = {Grundlagen der elliptischen {Geometrie.}}, journal = {Commentarii mathematici Helvetici}, pages = {246--253}, publisher = {mathdoc}, volume = {5}, year = {1933}, zbl = {0006.31901}, url = {http://geodesic.mathdoc.fr/item/CMH_1933__5_138600/} }
Anna Fischer. Grundlagen der elliptischen Geometrie.. Commentarii mathematici Helvetici, Tome 5 (1933), pp. 246-253. http://geodesic.mathdoc.fr/item/CMH_1933__5_138600/