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3. W. E. Roake, ibid. 104 (1957) 661.
4. M. O. Dustin, J. M. Savino, D. E. Lacy, R. P. Migra, A. L. Juhasz and C. E. Coles, “Solar Engineering-1987” edited by D. Y. Goswami, K. Watanabe and H. M. Healey, (The American Society of Mechanical Engineers, New York 1987) p. 574.
5. S. V. Raj and J. D. Whittenberger, J. Amer. Ceram. Soc., 73 (1990) 403.