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2. J.W. Downs, M.S. Thesis, Virginia Polytechnic Institute and State University, Blacksburg, Virginia (1980).
3. R.J. Hill, M. Newton and G.V. Gibbs, in preparation.
4. F. Ross and D. Griffen, Neutron refinement of the crystal structure of euclase, unpublished.
5. P. Coppens, T. Guru Row, P. Leung, E. Stevens, P. Becker and Y. Yang, Acta Crystallogr. A35:63 (1979).