1. D. J. Thouless, Phys. Rep. 13, 94 (1974).
2. R. Landauer, AIP Conf. Proc. 40, 2 (1978).
3. D. A. G. Bruggeman, Ann. Phys. 23, 636 (1935).
4. F. Bommeli, L. Degiorgi, L. Forro, and W. A. de Heer, The Science and Technology of Carbon Nanotubes, Ed. by K. Tanaka, T. Yamabe, and K. Fukui (Elsevier, New York, 1999), Chap. 9.
5. W. Lu and J. Dong, Phys. Rev. B 63, 033 401 (2000).