TY - JOUR AU - Fečkan, Michal TI - Problems with nonlinear boundary value conditions JO - Commentationes Mathematicae Universitatis Carolinae PY - 1992 SP - 597 EP - 604 VL - 33 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMUC_1992__33_4_a3/ LA - en ID - CMUC_1992__33_4_a3 ER -