1. E. M. Levin, C. R. Robbins, H. F. McMurdie, and M. K. K , Phase Diagrams for Ceramists , 1964 . Edited byPhase Diagrams for Ceramists . Columbus, Ohio;. 113 , 113 , and113 ; 1964 edition, Fig. 2286.
2. Properties of sodium titanium silicate glasses