1. S. C. Jain and W Hayes, Semicon. Sci. Technol.6, 547 (1991).
2. H. J. Osten, E. Bugiel and P. Zaumseil, Appl. Phys. Lett.64, 20 (1994).
3. E. Kasper and F. Schaffler,Strained-Layer Superlattices: Materials Science and Technology, Semiconductor and Semimetals, Vol. 33, edited by T. P. Pearsall (Academic, London, 1991), Chap. 4, pp. 295–296.
4. R. Hull, J. C. Bean, J. M. Bonar, G. S. Higashi, K. T. Short, H. Temkin and A. E. White, Appl. Phys. Lett.56, 2446 (1990).
5. D. Y. C. Lie, J. H. Song and M. -A. Nicolet, Appl. Phys. Lett.66, 30 (1995).