TY - JOUR AU - Kečkemétyová, Mária TI - On the existence of a solution for nonlinear operator equations in Fréchet spaces JO - Mathematica slovaca PY - 1992 SP - 43 EP - 54 VL - 42 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MASLO_1992__42_1_a3/ LA - en ID - MASLO_1992__42_1_a3 ER -