1. 1For example: (a)Proceedings 3d Space Processing Symposium, Skylab Results, Vols. I and II, Rept. M-74-5, NASA, Washington, D.C. , 1974 .
2. (b)Space Processing Applications Rocket Project , SPAR I Final Report, Rept. NASA TM X-3458, NASA, Washington, D.C., 1976 .
3. (c)Apollo-Soyuz Test Project Preliminary Science Report, Rept. NASA TM X-58173, NASA, Washington, D.C. , 1976 .
4. Crystallization and Microstructure of Nepheline Glass-Ceramics
5. 3W. B. Crandall, D. C. Larsen, and M. A. Ali ; pp. 925 -38 inVol. II , Ref. l(a).