@article{01960542, title = {The hyperbolic metric of a rectangle.}, journal = {Annales Academiae Scientiarum Fennicae. Mathematica}, volume = {26}, year = {2001}, pages = {401-407}, zbl = {1017.30054}, language = {en}, url = {http://dml.mathdoc.fr/item/01960542} }
Beardon, A.F. The hyperbolic metric of a rectangle.. Annales Academiae Scientiarum Fennicae. Mathematica, Tome 26 (2001) pp. 401-407. http://gdmltest.u-ga.fr/item/01960542/