1. Khobaib, M. and Kristenal, R. C. ‘High Temperature Coatings’ , The Metallurgy Society, Warrendale. PA, 1986
2. Singhal, S. C. ‘High Temperature Protective Coatings’ , The Metallurgical Society of AIME, Warrendale. PA, 1983
3. Massal ski, T. B. (Ed.) ‘Binary Phase Diagrams’, 2nd Edn, Vol. I , The Materials Information Society, Materials Park, OH, 1990, p. 183