TY - JOUR AU - P. E. Sobolevskii TI - Fractional powers of coercively positive sums of operators JO - Doklady Akademii Nauk PY - 1975 SP - 1271 EP - 1274 VL - 225 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1975_225_6_a8/ LA - ru ID - DAN_1975_225_6_a8 ER -