TY - JOUR AU - A. A. Dezin TI - Operators involving a first derivative with respect to time and nonlocal boundary conditions JO - Izvestiya. Mathematics PY - 1967 SP - 57 EP - 79 VL - 1 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IM2_1967_1_1_a4/ LA - en ID - IM2_1967_1_1_a4 ER -