1. The Properties of Diamond, edited by J. E. Field (Academic Press, London, 1990, 674 pp.).
2. B. V. Spitsyn, in Handbook of Crystal Growth, Vol. 3 (Elsevier, North-Holland, 1994, p. 403.).
3. J. E. Graebner, Diamond Films Technol. 3, 77 (1993).
4. E. P. Visser, E. H. Versteegen, and W. J. P. van Enckervort, J. Appl. Phys. 71, 3238 (1992).
5. T. R. Anthony, W. F. Banholzer, J. F. Fleisher et al., Phys. Rev. B 4, 1104 (1990).