1. Parr, R.: Quantum Theory of Molecular Structure, W. A. Benjamin, Inc. New York, 1964.
2. Parr, R. G.: Quantum Theory of Molecular Electronic Structure, W. A. Benjamin, Inc., New York, 1963.
3. Shchegolev, I. F.: Review Article on the ‘Highly Conductivity Salts’, to appear in Physica Status Solidi.
4. Kepler, R. G.: in T. A. Bak (ed.), Phonons and Phonon Interactions, W. A. Benjamin, Inc., New York, 1964.
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