Livros
N. Dunford and J.T. Schwartz, Linear Operators, Part 1 and 2.
I. Gohberg, S. Goldberg, M. Kaashoek, Classes of Linear Operators, Vol. I. 
E. Kreyszig, Introductory functional analysis with applications.
K. Schmudgen, Unbounded Self-adjoint Operators on Hilbert Space.
R. Schnaubelt, Lecture Notes. Spectral Theory. PDF
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