1. Representation of *-algebras;Arens, Richard;Duke Math. J.,1947
2. On the imbedding of normed rings into the ring of operators in Hilbert space;Gelfand, I.;Rec. Math. [Mat. Sbornik] N.S.,1943
3. Normed rings with involutions and their representations;Gel′fand, I. M.;Izvestiya Akad. Nauk SSSR. Ser. Mat.,1948
4. Measure Theory
5. A representation theory for commutative topological algebra;Kadison, Richard V.;Mem. Amer. Math. Soc.,1951