1. P. K. Rohatgi,J. Metals November (1994) 55.
2. P. K. Rohatgi, B. N. Keshavaram, P. Huang, R. Guo, D. M. Golden, S. Reinhardt andD. Odor, in ?Proceedings of the Tenth International Ash Use Symposium?, January 1993, edited by D. M. Golden, pp. 76?1.
3. G. F. Brendel, in ?Proceedings of the 11th International Symposium on Use and Management of Coal Combustion By-Products (CCB's)?, January 1995, edited by S. S. Tyson, pp. 66?1.
4. S. Jalai,ibid., pp. 68?1.
5. P. K. Rohatgi, R. Asthana andS. Das,Int. Metals Revs. (1986) 115.