%0 Journal Article %A D. I. Borisov %T Perturbations of the Continuous Spectrum of a Certain Nonlinear Two-Dimensional Operator Sheaf %J Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory %D 2018 %P 13-24 %V 152 %I mathdoc %U http://geodesic.mathdoc.fr/item/INTO_2018_152_a1/ %G ru %F INTO_2018_152_a1