1. J.-P. Antoine, A. Inoue, C. Trapani, Partial *-Algebras and Their Operator Realizations. Mathematics and Its Applications, vol. 553 (Kluwer, Dordrecht, 2002).
2. K. Schmüdgen, Unbounded Operator Algebras and Representation Theory (Akademie, Berlin, 1990)
3. G.R. Allan, A spectral theory for locally convex algebras. Proc. Lond. Math. Soc. 15, 399–421 (1965)
4. J.-P. Antoine, A. Inoue, C. Trapani, Partial *-algebras of closable operators. I. The basic theory and the abelian case. Publ. RIMS, Kyoto Univ. 26, 359–395 (1990)
5. J.-P. Antoine, A. Inoue, C. Trapani, Partial *-algebras of closable operators. II. States and representations of partial *-algebras. Publ. RIMS, Kyoto Univ. 27, 399–430 (1991)