TY - JOUR AU - O. N. Evkhuta AU - P. P. Zabreiko TI - A principle for study of quasi-gradient methods of approximate solving operator equations in Hilbert spaces JO - Trudy Instituta matematiki PY - 2011 SP - 32 EP - 44 VL - 19 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TIMB_2011_19_1_a3/ LA - ru ID - TIMB_2011_19_1_a3 ER -