The Spectral Theorem for Unbounded Self-Adjoint Operators
Publisher
Springer New York
Reference2 articles.
1. S.J. Bernau, The spectral theorem for unbounded normal operators. Pacific J. Math. 19, 391–406 (1966)
2. W. Rudin, Functional Analysis, 2nd edn. International Series in Pure and Applied Mathematics (McGraw-Hill, New York, 1991)