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3. See e.g.: Synthetic Modulated Structures, eds. L.L. Chang and B.C. Giessen (Academic, New york, 1985).
4. A. Gavrin and C.L. Chien, J. Appl. Phys. 67, 938 (1990).
5. J.R. Childress and C.L. Chien, Appl. Phys. Lett. 56, 95 (1990).