TY - JOUR AU - Zizler, Václav E. TI - On the differentiability of mappings in Banach spaces JO - Commentationes Mathematicae Universitatis Carolinae PY - 1967 SP - 415 EP - 430 VL - 08 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMUC_1967__8_3_a4/ LA - en ID - CMUC_1967__8_3_a4 ER -