TY - JOUR AU - N. V. Artamonov TI - Estimate of the Decay Exponent of an Operator Semigroup Associated with a Second-Order Linear Differential Equation JO - Matematičeskie zametki PY - 2012 SP - 780 EP - 783 VL - 91 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_2012_91_5_a13/ LA - ru ID - MZM_2012_91_5_a13 ER -