1. Private Communication, Marketing Data Bank, G.A.M.I. Gorham, ME 04038(1991)
2. Advanced Fibers for Advanced Composites;Buck;Advanced Materials and Processes,1987
3. Recent Developments in Fiber-Reinforced High Temperature Ceramic Composites;Mah;Ceramic Bull.,1987
4. Ceramic Bulletin 66(3):424(1987)
5. Boron and Refractory Borides;Krukonis,1977