1. F. W. Cole, J. B. Padden, and A. R. Spencer: Oxidation Resistant Materials for Transpiration-Cooled Gas Turbine Blades (II. Wire Specimen Tests), NASA CR-1184, September, 1968.
2. P. Kofstad:High-Temperature Oxidation of Metals, pp. 12,18, John Wiley & Sons, Inc., New York, 1966.
3. W. C. Hagel and A. U. Seybolt:J. Electrochem. Soc, 1961, vol. 108, p. 1146.
4. E. A. Gulbransen and K. F. Andrew:J. Electrochem. Soc, 1957, vol. 104, p. 334.
5. S. J. Grisaffe and C. E. Lowell: Examination of Oxide Scales on Heat Resisting Alloys, NASA TN D-5019, February, 1969.