TY - JOUR AU - Neumann, Jan TI - An abstract differential equation and the potential bifurcation theorems by Krasnosel'skij JO - Commentationes Mathematicae Universitatis Carolinae PY - 1987 SP - 261 EP - 276 VL - 28 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMUC_1987__28_2_a8/ LA - en ID - CMUC_1987__28_2_a8 ER -