1. Abrikosov, A. A., Gorkov, L. P., and Dzyaloshinskii, I. Ye., 1965, “Quantum Field Theoretical Methods in Statistical Physics”, Pergamon Press, Oxford.
2. Abstreiter, G., Merlin, R., and Pinczuk, A., 1988, IEEE J. Quantum Electron. QE-22:.
3. Altshuler, B. L., Khmelnitskii, D. E., Larkin, A. I., and Lee, P. A., 1980, Phys. Rev. B22:5142.
4. Ando, T., Fowler, A. B., and Stern, F., 1982, Rev. Mod. Phys.54:437.
5. Ando, T., 1977, Z. Phys. B26:263.