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2. Modulation Spectroscopy, Academic Press, New York 1969.
3. in: Optical Properties of Solids, Ed. , North-Holland Publ. Co., Amsterdam 1972 (p. 163).
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5. and , in: Optical Properties of Solids — New Developments, Ed. , North-Holland Publ. Co., Amsterdam 1976 (p. 255).