1. D. J. Thouless, The Quantum Mechanics of Many-Body Systems (Academic Press, New York, 1972).
2. D. Pines and P. Noziéres, The Theory of Quantum Liquids (Benjamin, New York, 1966).
3. G. E. Brown, Many Body Problems (North Holland, Amsterdam, 1971).
4. E. Feenberg, Theory of Quantum Fluids (Academic Press, New York, 1969).
5. D. G. Sandler, J. W. Clark, and E. Krotscheck, these proceedings; and to be published.