1. L. Holland, “The Properties of Glass Surfaces”, Chapt. 5, John Wiley & Sons, Inc., New York, 1964.
2. F.M. Ernsberger, Ann. Rev. Mater. Sci., 2, 529 (1972).
3. G.R. Sparrow and H.E. Mismash, in “Quantitative Surface Analysis of Materials” (ASTM Special Technical Publication #643), N.S. Mclntyre, Editor, p. 164, ASTM, Philadelphia, PA, 1977.
4. J.P. Rynd and A.K. Rastogi, Ceramic Bull., 53, 631 (1974).
5. C.G. Pantano and L.L. Hench, J. Testing Evaluation, 5, 66 (1977).