1. L. A. Taylor, Yb. Carnegie Instn. Wash., 68 (1970) 259.
2. W. E. Ewers, Proc. Aust. Inst. Min. Met., 241 (1972) 19.
3. E. M. Bollin, Differential Thermal Analysis (McKenzie, ed.) Academic Press, London, (1970) 193.
4. I. Asenia andG. Sabatier, Bull. Soc. Franc. Mineral. Crist. 81 (1958) 12.
5. O. C. Kopp andP. M. Kerr, Am. Miner. 43 (1958) 732.