Unbounded Self-adjoint Operators on Hilbert Space (Graduate Texts in Mathema...

Theory Of Linear Operators In Hilbert Space Vol. 1 - 1966 Akhiezer & Glazman HC

Unbounded Self-adjoint Operators on Hilbert Space by Konrad Schm?dgen (English)

A HILBERT SPACE PROBLEM BOOK by Paul R. Halmos

Hilbert Spaces of Entire Functions by Louis de Branges 1968 DJ eigenfunction

METHODS OF HILBERT SPACES by KRZYSZTOF MAURIN (2nd Rev. Ed.)

Introduction to Hilbert Space by Sterling K. Berberian, (Hardcover)

A Course in Modern Mathematical Physics: Groups, Hilbert Space and Different...