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A. F. Beardon 1
@article{AFM_2001_26_2_a6, author = {A. F. Beardon}, title = {The hyperbolic metric of a rectangle}, journal = {Annales Fennici Mathematici}, pages = {401--407}, publisher = {mathdoc}, volume = {26}, number = {2}, year = {2001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AFM_2001_26_2_a6/} }
A. F. Beardon. The hyperbolic metric of a rectangle. Annales Fennici Mathematici, Tome 26 (2001) no. 2, pp. 401-407. http://geodesic.mathdoc.fr/item/AFM_2001_26_2_a6/