1. M. Jacob, Heat Transfer, Vol. 1 (7th printing), p. 151, John Wiley and Sons, New York (1959).
2. J.S. Cammerer, Der Wärme- und Kälteschutz in der Industrie, Springer-Verlag, Berlin (1962).
3. A.W. Pratt, Heat Transmission in low-Conductivity Materials. Thermal Conductivity, Vol. 1 ( R.P. Tye, ed.), Academic Press, New York (1969).
4. ASTM Special Technical Publication, No. 217 (1957); No. 411 (1967); No. 544 (1974); No. 660 (1978); No. 718 (1980).
5. Conference on Thermal Conductivity, Vol. 1 a 17.