%0 Journal Article %A D. V. Valovik %T The spectral properties of some nonlinear operators of Sturm-Liouville type %J Sbornik. Mathematics %D 2017 %P 1282-1297 %V 208 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_2017_208_9_a1/ %G en %F SM_2017_208_9_a1