1. Springthorpe, A.J., King, F.D., Becke, A.: J. Electron. Mater. 4 (1975) 101.
2. Lang, D.V., Logan, R.A., Kimmerling, L.C.: Proc. 13th Int. Conf. on Semiconductors, Rome 1976, Fumi, F.C. (ed.), Amsterdam: North Holland, p. 615.
3. Lang, D.V., Logan, R.A.: Phys. Rev. Lett. 39 (1977) 635.
4. Lang, D.V., Logan, R.A., Kimerling, L.C.: Phys. Rev. B 15 (1977) 4874.
5. Kravchenko, A.F., Prints, V.Ya.: Sov. Phys. Semicond. (English Transl.) 12 (1978) 952.