1. See various articles in “Synthetic Modulated Structures”, L. L. Chang and B. C. Giessen, Academic Press, Inc., Orlando (1985).
2. See various articles in “Interfaces, Superlattices and Thin Films”, J. D. Dow and I. K. Schuller, Material Research Society Publishers, Pittsburgh (1987).
3. I. K. Schuller and H. Homma, MRS Bulletin XII, 18 (1987).
4. See for instance, D. B. McWhan in “Synthetic Modulated Structures”, p. 43.
5. I. K. Schuller, Phys. Rev. Lett. 44, 1597 (1980).