1. R. E. Wawner, in ?Boron?, Vol. II, edited by G. K. Gaule (Plenum Press, New York 1965) pp 283?300.
2. Idem, in ?Modern Composite Materials?, edited by L. J. Broutman and R. H. Krock (Addison Wesley, Reading, Mass, 1967) pp. 244?269.
3. L. E. Line, Jun. andU. V. Henderson, in ?Hand-book of Fiberglass and Advanced Plastic Composites?, edited by G. Lubin (Van Nostrand Reinhold, New York, 1969) pp. 201?236.
4. A. H. Lasday andC. P. Talley, in ?Advanced Fibrous Reinforced Composites?, (Society of Aerospace Material and Processing Engineers, Vol. 10 Azusa, California, 1966) pp. D1-D12.
5. ASTM STP 497;K. G. Kreider,1972