%0 Journal Article %A M. A. Lyalinov %T Eigenfunctions of negative spectrum for the Schr\"odinger operator in a halfplane having singular potential on a ray and with Neumann boundary condition %J Zapiski Nauchnykh Seminarov POMI %D 2020 %P 232-258 %V 493 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_2020_493_a15/ %G ru %F ZNSL_2020_493_a15