TY - JOUR AU - M. A. Lyalinov TI - 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 JO - Teoretičeskaâ i matematičeskaâ fizika PY - 2022 SP - 287 EP - 319 VL - 213 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TMF_2022_213_2_a4/ LA - ru ID - TMF_2022_213_2_a4 ER -