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@article{KUMEM_1995_3_a4, author = {H. S. M. Coxeter}, title = {Angles and arcs in the hyperbolic plane}, journal = {In memoriam N. I. Lobatschevskii}, pages = {120--134}, publisher = {mathdoc}, volume = {3}, year = {1995}, language = {en}, url = {http://geodesic.mathdoc.fr/item/KUMEM_1995_3_a4/} }
H. S. M. Coxeter. Angles and arcs in the hyperbolic plane. In memoriam N. I. Lobatschevskii, In memoriam N. I. Lobatschevskii, Tome 3 (1995), pp. 120-134. http://geodesic.mathdoc.fr/item/KUMEM_1995_3_a4/