1. J. SAGGIO-WOYANSKY, C. E. SCOTT and W. P. MINNEAR, Bull. Am. Ceram. Soc.
71 (1992) 1674.
2. K. SCHWARTZWALDER, and A. V. SOMERS, Articles US Pat. 3090094, 21 May 1963.
3. W. P. MINNEAR, in “Ceramic Transactions 26, Forming Science and Technology for Ceramics,” edited by M.J. CIMA (American Ceramic Society, Westerville, OH, 1992) pp. 149–56.
4. S. J. POWEEL and J. R. G. EVANS, Mater. Manuf. Proc., 10 (1995) 757.
5. A. R. INGRAM and J. FOGEL, in “Plastic Foams”, Pt II, edited by K. C. FRISCH and J. H. SAUNDERS (Marcel Dekker, New York, 1973) pp. 525–638.