TY  - JOUR
AU  - J. Ławrynowicz
TI  - On a class of quasi-conformal mappings with invariant boundary points, I. The class $E_Q$ and and the general extremal problem
JO  - Annales Polonici Mathematici
PY  - 1968
SP  - 309
EP  - 324
VL  - 21
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/ap-21-3-309-324/
DO  - 10.4064/ap-21-3-309-324
LA  - en
ID  - 10_4064_ap_21_3_309_324
ER  -