1. R. J. Elliott and R. Loudon, J. Phys. Chem. Solids 15, 196 (1960).
2. M. I. Dykman, P. M. Platzman, and P. Seddighrad, Phys. Rev. B: Condens. Matter Mater. Phys. 67, 55402 (2003).
3. Carbon Nanotubes. Advanced Topics in the Synthesis, Structure, Properties and Applications, in Springer Series ‘Topics in Applies Physics’ (Springer, Berlin, 2008).
4. M. M. Nieto, Phys. Rev. A: At., Mol., Opt. Phys. 61, 034901 (2000).
5. R. V. Jensen, S. M. Susskind, and M. M. Sanders, Phys. Rep. 201, 1 (1991).