TY - JOUR AU - Kenneth P. Goldberg TI - On a class of extremal quasi-conformal mappings JO - Annales Polonici Mathematici PY - 1976 SP - 59 EP - 70 VL - 32 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap-32-1-59-70/ DO - 10.4064/ap-32-1-59-70 LA - en ID - 10_4064_ap_32_1_59_70 ER -