[1] B. Aupetit, A Primer on Spectral Theory, Springer-Verlag, 1991.
[2] V.K. Balachandran, Topological Algebras, New York, Elsevier, 2000.
[3] H. Biller, Continuous inverse algebras with involution, Forum Math., 22(6), (2010), 1033-1059.
[4] L. Burlando, Continuity of spectrum and spectral radius in Banach algebras, Functional Analysis and Operator Theory,
Banach Center Publ., Institute of Mathematics, Polish Academy of Sciences, Warszawa, 30, (1994), 53-100.
[5] H.G. Dales, Banach Algebras and Automatic Continuity}, Clarendon Press, Oxford, 2000.
[6] T. Ghasemi Honary and M. Najafi Tavani, Upper semicontinuity of the spectrum function and automatic continuity in
topological $Q$-algebras, Note Mat., 28(2), (2008), 57-62.
[7] H. Goldmann, Uniform Frechet Algebras}, North-Holland, 1990.
[8] T. Husain, Multiplicative Functionals on Topological Algebras, Research notes in Math. 85, Pitmann Publishing, Boston,
1983.
[9] B.E. Johnson, The uniqueness of the complete norm topology, Bull. Am. Math. Soc., 73, (1967), 537-539.
[10] A. Mallios, Topological Algebras: Selected Topics, North-Holland, Amsterdam, 1986.
[11] A. Naziri-Kordkadi, Topics on continuous inverse algebras, J. Algebr. Syst., 9}(2), (2022), 219-227.
[12] A. Naziri-Kordkandi, A. Zohri, F. Ershad and B. Yousefi, Continuity in Fundamental Locally multiplicative topological
Algebras, Int. J. Nonlinear Anal. Appl., 12(1), (2021), 129-141.
[13] J.D. Newburgh, The variation of spectra, Duke Math. J., 18, (1951), 165-176.
[14] W. Rudin, Functional Analysis, McGraw- Hill, 1973.
)