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Progress of Theoretical Physics Vol. 6 No. 1 (1951) pp. 61-64 Theory of the Temperature Effect of Electronic Energy Bands in Crystal, II Toshinosuke Muto and Seiichi Ôyama Progress of Theoretical Physics Vol. 22 No. 3 (1959) pp. 455-457 A Proposed Model for the Explanation of the Urbach Rule Yutaka Toyozawa Progress of Theoretical Physics Vol. 22 No. 6 (1959) pp. 893-895 Line Shapes of I. M. O.-Absorption in the Semiconductors Tokio Ohta and Tohru Miyakawa Progress of Theoretical Physics Vol. 23 No. 2 (1960) pp. 229-250 Theory of Line-Shapes of Interband Magneto-Optical Absorption in Semiconductors Tokio Ohta, Moichiro Nagae and Tohru Miyakawa Progress of Theoretical Physics Vol. 25 No. 2 (1961) pp. 163-177 A Theory of the Magneto-Optical Absorption Makoto Okazaki
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Muto et al. (1950) studied this question.
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