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2. J. Simon, J. Thermal Anal., 5 (1973) 271.
3. T. B. Tang andM. M. Chaudhri, ibid. (in press).
4. P. D. Garn, Proc. 4th Int. Conf. Thermal Anal., Budapest, Vol. 1, 1974, p. 25.
5. V. V. Barzukin et al., ibid., 195.