TY - JOUR AU - A. R. Esayan AU - V. Ya. Stetsenko TI - Estimates of the spectrum of integral operators and infinite matrices JO - Doklady Akademii Nauk PY - 1964 SP - 254 EP - 257 VL - 157 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1964_157_2_a2/ LA - ru ID - DAN_1964_157_2_a2 ER -