@article{01208015, title = {On the area of a polygon in the hyperbolic plane.}, journal = {Beitr\"age zur Algebra und Geometrie}, volume = {39}, year = {1998}, pages = {423-432}, zbl = {0917.51019}, language = {en}, url = {http://dml.mathdoc.fr/item/01208015} }
Kántor, Sándor. On the area of a polygon in the hyperbolic plane.. Beiträge zur Algebra und Geometrie, Tome 39 (1998) pp. 423-432. http://gdmltest.u-ga.fr/item/01208015/