%0 Journal Article %A M. A. Lyalinov %T Schr\"odinger operator in a half-plane with the~Neumann condition on the~boundary and a singular $\delta$-potential supported by two half-lines, and systems of functional-difference equations %J Teoretičeskaâ i matematičeskaâ fizika %D 2022 %P 287-319 %V 213 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_2022_213_2_a4/ %G ru %F TMF_2022_213_2_a4