“…For unbounded measures this is not a case, in general. More precisely, any positive singular bilinear form t generates by (3.1) a regular measure that is not completely-additive, see [Dvu3,Thm 3.7.6], [Lug2]. A criterion when a bilinear form t generates a completely additive measure on L(H), see [Lug2], [Dvu3,Thm 3.7.5]: A positive bilinear form t defines through (3.1) a σ-finite completely additive measure on L(H) iff for any M ∈ L(H),…”