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@article{CMH_1986__61_140069, author = {Richard Fehlmann}, title = {On a fundamental variational lemma for extremal quasiconformal mappings.}, journal = {Commentarii mathematici Helvetici}, pages = {565--580}, publisher = {mathdoc}, volume = {61}, year = {1986}, zbl = {0624.30029}, url = {http://geodesic.mathdoc.fr/item/CMH_1986__61_140069/} }
Richard Fehlmann. On a fundamental variational lemma for extremal quasiconformal mappings.. Commentarii mathematici Helvetici, Tome 61 (1986), pp. 565-580. http://geodesic.mathdoc.fr/item/CMH_1986__61_140069/