1. K. J. Bayer, German Patent No: 2150677, 1972.
2. B. K. Parekh, Proc. 6th Min. Waste Utilization Symp., 6 (1976) 123.
3. B. K. Parekh and W. Goldberger, Report no: EPA-600/2-76-301, 1976.
4. R. S. Thakur and S. N. Das, Red mud analysis and utilisation, PID and Wiley Eastern, New Delhi 1994.
5. L. Merkin, Ph.D. Thesis, Machester University, 1996.