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@article{CMH_1980__55_139813, author = {F.W. Gehring and A.F. Beardon}, title = {Schwarzian derivatives, the {Poincar\'e} metric and the kernel function.}, journal = {Commentarii mathematici Helvetici}, pages = {50--64}, publisher = {mathdoc}, volume = {55}, year = {1980}, zbl = {0438.30014}, url = {http://geodesic.mathdoc.fr/item/CMH_1980__55_139813/} }
F.W. Gehring; A.F. Beardon. Schwarzian derivatives, the Poincaré metric and the kernel function.. Commentarii mathematici Helvetici, Tome 55 (1980), pp. 50-64. http://geodesic.mathdoc.fr/item/CMH_1980__55_139813/