TY - JOUR AU - A. N. Shelkovoy TI - Spectral properties of second order differential operator determined by non-local boundary conditions JO - Matematičeskaâ fizika i kompʹûternoe modelirovanie PY - 2018 SP - 18 EP - 33 VL - 21 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/VVGUM_2018_21_4_a1/ LA - ru ID - VVGUM_2018_21_4_a1 ER -