%0 Journal Article %A Jolanta Przybycin %T Nonlinear eigenvalue problems for fourth order ordinary differential equations %J Annales Polonici Mathematici %D 1994 %P 249-253 %V 60 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-60-3-249-253/ %R 10.4064/ap-60-3-249-253 %G en %F 10_4064_ap_60_3_249_253