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2. P. E. D. Morgan, and E. Scala, ?Sintering and Related Phenomena? (Gordon and Breach, 1967) p. 861.
3. A. C. D. Chaklader and R. C. Cook, Amer. Ceram. Soc. Bull. 47 (1968) 712.
4. T. A. Wheat and G. T. Carruthers, Trans. Brit. Ceram. Soc. 69 (1970) 85.
5. A. C. D. Chaklader and V. T. Baker, Amer. Ceram. Soc. Bull. 44 (1965) 258.