1. Report of the Subpanel on Coating (draft); Refractory Metals Sheet Rolling Panel of the Materials Advisory Board, February 1962.
2. O. Kubaschewski and B. E. Hopkins: J. of Less Common Metals, 1960, p. 172.
3. M. Nicholas and C. D. Dickinson: High-Temperature Protective Coatings for Refractory Metals, Part II; Sixth Meeting of the Refractory Composites Work Group, Dayton, Ohio, 1962.
4. Air Force Contract: AF 33 (616)-8175.
5. J. Loners: Compt. Rendus, 1952, p. 91.