TY - JOUR AU - V. D. Charushnikov TI - On optimal approximate methods for the solution of linear problems JO - Doklady Akademii Nauk PY - 1971 SP - 40 EP - 43 VL - 199 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1971_199_1_a9/ LA - ru ID - DAN_1971_199_1_a9 ER -