1. 1J. C. Wurst , "Thermal, Electrical, and Physical Property Measurements of Laser Window Materials ," Tech. Rept. UDRI-QPR-73-19, 1973 .
2. 2S. W. Freiman ; private communication.
3. 3A. G. Evans, R. C. Bradt, D. P. H. Hasselman, and F. F. Lange ; p.17 inFracture Mechanics of Ceramics , Vol. 1 . Plenum Press, New York, 1974 .
4. 5M. Linzer, and S. Parks ; unpublished work.