1. von Neumann, J. (1932) Die mathematische Grundlagen der Quanten-mechanik. Springer, Berlin. (See also von Neumann, I. (1955) Mathematical Foundation of Quantum Mechanics. Princeton University Press, Princeton.)
2. Description of States in Quantum Mechanics by Density Matrix and Operator Techniques
3. INFORMATION CONTENTS OF DISTRIBUTIONS
4. Fetter, A.L. and Walecka, J.D. (1971) Quantum Theory of Many-Particle Systems. McGraw-Hill, New York.
5. Feynman, R. P. (1972) Statistical Mechanics. Benjamin Cummings, Reading.