| Akhiezer, N.I. | Theory of Linear Operators in Hilbert Space. Volume I | 47 Operator theory |
| Akhiezer, N.I. | Theory of Linear Operators in Hilbert Space. Volume II | 47 Operator theory |
| Antonevich, Anatollij | Linear Functional Equations. Operator Approach | 47 Operator theory |
| Bachman, George | Functional Analysis | 47 Operator theory |
| Banach, Stefan | Operations Lineaires | 47 Operator theory |
| Browder, Felix | Nonlinear Operators in Banach Spaces | 47 Operator theory |
| Caradus, S | Operator Theory of the Pseudo Inverse | 47 Operator theory |
| Colojoara, Ion | Theory of Generalized Spectral Operators | 47 Operator theory |
| Ernest, John | Charting the Operator Terrain | 47 Operator theory |
| Faris, William G. | Self-Adjoint Operators | 47 Operator theory |
| Fillmore, Peter | Notes on Operator Theory | 47 Operator theory |
| Friedrichs, K.O. | Spectral Theory of Operators in Hilbert Space | 47 Operator theory |
| Goldberg, Seymour | Unbounded Linear Operators: Theory and Applications | 47 Operator theory |
| Goldberg, Seymour | Unbounded Linear Operators: Theory and Applications | 47 Operator theory |
| Halmos, Paul R. | Introduction to Hilbert Space and the Theory of Spectral Multiplicity | 47 Operator theory |
| Halmos, Paul | Introduction to Hibert Space | 47 Operator theory |
| Halmos, Paul | A Hilbert Space Problem Book | 47 Operator theory |
| Hille, Einar | Functional Analysis and Semi-groups | 47 Operator theory |
| Kato, T.L. | Perturbation Theory for Linear Operators | 47 Operator theory |
| Kuhn, H.W. | Linear Inequalities and Related Systems | 47 Operator theory |
| Moore, E.H. | General Analysis | 47 Operator theory |
| Müller-Pfeiffer, Erich | Spectral Theory of Ordinary Diffential Operators | 47 Operator theory |
| Nelson, Edward | Topics in Dynamics I: Flows | 47 Operator theory |
| Neumann, John V. | Functional Operators: Measures and Integrals | 47 Operator theory |
| Neumann, John V. | Functional Operators: The Geometry of Orthogonal Spaces | 47 Operator theory |
| Pazy, A. | Semigroups of Linear Operators and Applications to Partial Differential Equations | 47 Operator theory |
| Rado, Tibor | Subharmonic Functions | 47 Operator theory |
| Raikov, Gelfand | Commutative Normed Rings | 47 Operator theory |
| Rellich, Franz | Perturbation Theory of Eigenvalue Problems | 47 Operator theory |
| Shapiro, Joel H. | Composition Operators and Classical Function Theory | 47 Operator theory |
| Sinha, Kaylan B. | Theory of Semigroups and Applications | 47 Operator theory |
| Sunder, V.S. | Operators on Hilbert Space | 47 Operator theory |
| Zaidman, Samuel | Equations Differentielles Abstraites | 47 Operator theory |