TY - JOUR AU - L. M. Gershtein TI - Perturbation of the generating operator of an analytic semigroup JO - Funkcionalʹnyj analiz i ego priloženiâ PY - 1988 SP - 62 EP - 63 VL - 22 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FAA_1988_22_1_a7/ LA - ru ID - FAA_1988_22_1_a7 ER -