%0 Journal Article
%A J. Ławrynowicz
%T On a class of quasi-conformal mappings with invariant boundary points, I. The class $E_Q$ and and the general extremal problem
%J Annales Polonici Mathematici
%D 1968
%P 309-324
%V 21
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/ap-21-3-309-324/
%R 10.4064/ap-21-3-309-324
%G en
%F 10_4064_ap_21_3_309_324