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2. A. Bergholm:Trans. TMS-AIME, 1961, vol. 221, pp. 1121–29.
3. A. N. Zelikman and T. Segarchanu:J. Gen. Chem. USSR, 1956, vol. 26, pp. 721–24.
4. W. E. Dunn, Jr.:High Temperature Chlorination of TiO
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Bearing Minerals II, AIME Annual Meeting, San Francisco, February 1972.