TY - JOUR AU - B. Bollobas AU - E. Galanis TI - An Inequality Involving a Hermitian Operator and its Square in a Normed Space JO - Ευκλείδης Γ PY - 1987 SP - 44 EP - 49 VL - 17 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EUG_1987__17_a6/ LA - gr ID - EUG_1987__17_a6 ER -