Operator algebras and their modules an operator space approach by Blecher, David P., Le Merdy, Christian

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Applied functional analysis by Aubin, Jean Pierre

Perturbations of a class of ordinary differential expressions preserving the essential spectrum and the nullities by Victoria, Marie Redina L. Mumpar

Introduction to partial differential equations and Hilbert space methods by Gustafson, Karl E.

Applied functional analysis. by Aubin Jean-Pierre

Introduction to Hilbert spaces with applications. by Debnath, Lokenath

Introduction to Hilbert space and the theory of spectral multiplicity by Halmos, Paul R. (Paul Richard) 1916-2006

Stochastic analysis and random maps in Hilbert space. by Dorogovtsev, A. A.

Hilbert space methods in probability and statistical inference. by Small, Christopher G.

Hilbert space methods in science and engineering. by Mate, Laszlo