TY - JOUR AU - A. G. Baskakov TI - Semigroups of Difference Operators in Spectral Analysis of Linear Differential Operators JO - Funkcionalʹnyj analiz i ego priloženiâ PY - 1996 SP - 1 EP - 11 VL - 30 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FAA_1996_30_3_a0/ LA - ru ID - FAA_1996_30_3_a0 ER -