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@article{CMH_1978__53_139738, author = {Kurt Strebel}, title = {On quasiconformal mappings of open {Riemann} surfaces.}, journal = {Commentarii mathematici Helvetici}, pages = {301--321}, publisher = {mathdoc}, volume = {53}, year = {1978}, zbl = {0421.30017}, url = {http://geodesic.mathdoc.fr/item/CMH_1978__53_139738/} }
Kurt Strebel. On quasiconformal mappings of open Riemann surfaces.. Commentarii mathematici Helvetici, Tome 53 (1978), pp. 301-321. http://geodesic.mathdoc.fr/item/CMH_1978__53_139738/