1. H. B. Weiser and W. O. Milligan, in ?Advances in Colloid Science?, Vol. I, edited by E. O. Kramer, E. F. Bartet and S. S. Kistler (Interscience, New York, 1942) p. 227.
2. Idem, J. Phys. Chem. 44 (1940) 1081.
3. R. C. Mackenzie and G. Berggren, in ?Differentiatial Thermal Analysis?, Vol. I, edited by R. C. Mackenzie (Academic Press, London, 1970) p. 277.
4. R. C. Mackenzie and R. C. Meldau, Mineral. Mag. 33 (1959) 153.
5. M. Kobayashi and M. Uda, J. Non Crystalline Solids 29 (1978) 419.