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2. F. A. Kroger, Chemistry of Imperfect Crystals. (North Holland, Amsterdam, 1964)
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4. J. J. Gilman, The Art and Science of Growing Crystals. (Wiley New York, 1963)
5. M. Tanenbaum, Semiconductors (Edited by N. B. Hannay). (Reinhold, New York, 1959)