1. A. Tauqir, I. Salam, F.H. Hashmi, and A.Q. Khan: Eng. Failure Anal., 1996, vol. 3 (3), pp. 203–10.
2. I. Salam, A. Tauqir, and A.Q. Khan: Eng. Failure Anal., Vol. 4, No. 1, 1997.
3. Ernest M. Levin, Carl R. Robbins, and Howard F. McMurdie: in Phase Diagrams for Ceramists, vol. I, Margie K. Reser, ed., compiled at the National Bureau of Standards, The American Ceramic Society, Columbus, OH, 1964, pp 209–19 and 236–52.
4. Ernest M. Levin, Carl R. Robbins, and Howard F. McMurdie: in Phase Diagrams for Ceramists, vol. II, Margie K. Reser, ed., compiled at the National Bureau of Standards, The American Ceramic Society, Columbus, OH, 1969, pp. 37, 58 and 138.
5. Robert S. Roth, Taki Negas and Lawrence P. Cook: in Phase Diagrams for Ceramists, vol. IV, Geraldine Smith, ed, compiled at the National Bureau of Standards, The American Ceramic Society, Columbus, OH, 1981, p. 215.