1. 1W. H. Gitzen , Alumina as a Ceramic Material ; p.35 . Special Publication No. 4, The American Ceramic Society, Inc., Columbus, OH1970 .
2. 2A. L. Mackay, J. H. Boer, W. G. Burgers, E. W. Gorter, J. P. F. Huesse, and G. C. A. Schuit ; pp.571 -83 inReactivity of Solids-Proceedings of 4th Symposium, Amsterdam , 1960 . Elsevier Publishing Co., Princeton, NJ1960 .
3. 3J. Beretka, and M. J. Ridge , "Dehydration Products of Aluminum Hydroxides ,"J. Chem. Soc. A, 1967 , No. 12, pp.2106 -2109 .
4. 4M. J. Ridge, B. Molony, and G. R. Boell , "Transformation of Finely Divided Cubic to Trigonal Iron(III) Oxide,"ibid., No. 4, pp.594 -97 .
5. An Electron Diffraction Study and a Theory of the Transformation from γ-Fe2O3to α-Fe2O3