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@article{BNYMS_1893__2_186503, author = {W. Woolsey Johnson}, title = {A {Case} of {Non-Euclidian} {Geometry.}}, journal = {Bulletin of the New York Mathematical Society}, pages = {158--161}, publisher = {mathdoc}, volume = {2}, year = {1893}, zbl = {25.0866.03}, url = {http://geodesic.mathdoc.fr/item/BNYMS_1893__2_186503/} }
W. Woolsey Johnson. A Case of Non-Euclidian Geometry.. Bulletin of the New York Mathematical Society, Tome 2 (1893), pp. 158-161. http://geodesic.mathdoc.fr/item/BNYMS_1893__2_186503/