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@article{JDM_1912__21_145338, author = {Arthur Ranum}, title = {Lobachefskian {Polygons} {Trignometrically} {Equivalent} to the {Triangle.}}, journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung}, pages = {228--240}, publisher = {mathdoc}, volume = {21}, year = {1912}, zbl = {43.0563.03}, url = {http://geodesic.mathdoc.fr/item/JDM_1912__21_145338/} }
Arthur Ranum. Lobachefskian Polygons Trignometrically Equivalent to the Triangle.. Jahresbericht der Deutschen Mathematiker-Vereinigung, Tome 21 (1912), pp. 228-240. http://geodesic.mathdoc.fr/item/JDM_1912__21_145338/