TY - JOUR AU - D. Yu. Ivanov TI - Closedness of sums of unbounded operators acting on different variables in the spaces of square-integrable functions of several variables JO - Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika PY - 2017 SP - 35 EP - 48 IS - 45 UR - http://geodesic.mathdoc.fr/item/VTGU_2017_45_a2/ LA - ru ID - VTGU_2017_45_a2 ER -