TY - JOUR AU - Jolanta Przybycin TI - The connection between number and form of bifurcation points and properties of the nonlinear perturbation of Berestycki type JO - Annales Polonici Mathematici PY - 1989 SP - 129 EP - 136 VL - 50 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap-50-2-129-136/ DO - 10.4064/ap-50-2-129-136 LA - en ID - 10_4064_ap_50_2_129_136 ER -