1. Alvey, M.D. and George, P.M.(1991) Carbon, 29, 523.
2. Awasthi, S. and Wood, J.L. (1988) Adv. Ceram. Mater., 3, 449.
3. Becher, P.F., Hsueh, C.H., Angelini, P., and Tiegs, T.N. (1988) J. Amer. Ceram. Soc., 71, 1050.
4. Billman, E., Mehrotra, P., Shuster, A., and Beeghly, C. (1988) Amer. Ceram. Soc. Bull., 67, 1016.
5. SAMPE, paper # EM88-535;DJ Bray,1988