1. V. Rehn, J. L. Stanford, and V. O. Jones, Proc. Int. Conf. Phys. Semicond., 13th, Rome, 1976 (F. G. Fumi, ed.), p. 985. Typografia Marves, Rome, 1976.
2. G. Leveque and D. A. Lynch, private communication (1982).
3. Higher Absorption Edges in6HSiC
4. Absorption freier Ladungsträger in α-SiC-Kristallen