1. H. Araki andG. A. Elliott, On the definition ofC *-algebras,Publ. Res. Inst. Math. Sci. (Kyoto) 9 (1973), 93–112.MR 50#8085
2. I. M. Gelfand andM. A. Naîmark (Neumark), On the imbedding of normed rings into the ring of operators in Hilbert space,Mat. Sbornik 12 (1943), 197–217.MR 5-147
3. C. E. Rickart,General theory of Banach algebras, New York, Van Nostrand, 1960.MR 22 # 5903
4. Z. Sebestyén,Axiomatikus vizsgálatok a C * -algebrák köréből (Investigations in axiomatic C * -algebra theory), Dissertation for candidate degree, Budapest, 1974. (In Hungarian)