%0 Journal Article %A J. Ɓawrynowicz %T On certain functional equations for quasiconformal mappings %J Annales Polonici Mathematici %D 1968 %P 153-165 %V 20 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-20-2-153-165/ %R 10.4064/ap-20-2-153-165 %G en %F 10_4064_ap_20_2_153_165