1. J. L. SHAY and J. H. WERNICK, ?Ternary Chalcopyrite Semiconductors: Growth, Electronic Properties and Applications? (Pergamon, Oxford, 1975).
2. N. YAMAMOTO, H. HORINAKA and T. MIYAUCHI,Jpn. J. Appl. Phys. 18 (1979) 255.
3. H. KILDAL, PhD thesis, Stanford University, California, USA, (1972) (unpublished).
4. A. MILLER, R. G. HUMPHREYS and B. CHAPMAN,J. Phys. Coll. 36 (1975) C3?31.
5. T. NAKAU, H. NIMURA, Y. OZAKI, S. KAMADA and T. HISAMATSU,Jpn. J. Appl. Phys. 17 (1978) 1677.