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3. H. Bensh, H. Witte and E. Wolfel, Z. Phys. Chem., 4 (1955) 36.
4. I. N. Sirota, A. U. Sheler and E. M. Gololobov, in: Khimicheskaya svyaz v kristallakh, Minsk, Nauka i tekhnika, 1969, p. 136.
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