1. Cahiers Scientifiques, Fasc. XXV;Dixmier, Jacques,1957
2. Les anneaux d’opérateurs de classe finie;Dixmier, J.;Ann. Sci. \'{E}cole Norm. Sup. (3),1949
3. The Radon-Nikodým theorem for finite rings of operators;Dye, H. A.;Trans. Amer. Math. Soc.,1952
4. 𝐶*-algebras with smooth dual;Fell, J. M. G.;Illinois J. Math.,1960
5. On the imbedding of normed rings into the ring of operators in Hilbert space;Gelfand, I.;Rec. Math. [Mat. Sbornik] N.S.,1943