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- [3] NOTE ON HERMITIAN ELEMENTS OF A BANACH ALGEBRA JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1973, 6 (MAY): : 427 - 428
- [4] BANACH ALGEBRAS RELATED TO THE ELEMENTS OF THE UNIT BALL OF A BANACH ALGEBRA TAIWANESE JOURNAL OF MATHEMATICS, 2008, 12 (07): : 1769 - 1779