1. Proc. 5th Intern. Symp. GaAs, Deauville 1974 (Inst. of Physics, London) to be published
2. A. M. Mohsen, M. F. Tompsett: IEEE Trans. Electron Dev. ED-21, 701 (1974)
3. T. Ikoma, T. Okumura: ESSDERC 1974 (unpublished)
4. C. H. Henry, D. V. Lang: Proc. 12th Intern. Conf. Physics of Semiconductors, Stuttgart 1974, ed. by M. Pilkuhn (B. G. Teubner, Stuttgart 1974) (ISBN 3-519-03013-6) 411
5. D. Bois, P. Pinard: Phys. Rev. B9, 4171 (1974)