1. For recent review, see H. S. Chen, Rep. Prog. Phys. 43, 353 (1980).RPPHAG0034-4885
2. T. Egami, Mater. Res. Bull. 13, 557 (1978).MRBUAC0025-5408
3. H. S. Chen, L. C. Kimerling, J. M. Poate and W. L. Brown, Appl. Phys. Lett. 32, 461 (1978).APPLAB0003-6951
4. H. S. Chen, Sci. Reports, RITU, 27A, 98 (1979).
5. H. S. Chen and C. E. Miller, Mater. Res. Bull. 11, 49 (1975).MRBUAC0025-5408