1. Roy, D. M., and Grutzeck, M. W., Fifth Intern. Symp. Chemistry of Cement, Tokyo (October 1968).
2. White, E. W., Denny, P. J., and Irving, S., in The Electron Microprobe (edit. by McKinley, Heinrich, and Wittry), 791 (John Wiley and Sons, 1966).
3. Keil, K., Fortschritte der Mineralogie, 44, 4 (1967).
4. White, E. W., and Rustom, R., Proc. Symp. IITRI, 91 (1968).
5. Grutzeck, M. W., thesis, The Pennsylvania State University (1968).