@article{CTT100877607,
  author = {Y. Akai and S. Saito},
  title = {Electronic structure, energetics and geometric structure of carbon nanotubes: A density-functional study},
  journal = {Physica E},
  year = 2005,
}

@article{CTT100877614,
  author = {Y. Akai and S. Saito},
  title = {Systematic First-Principles Electronic-Structure Study of Carbon Nanotubes},
  journal = {Proceedings of 27th International Conference on the Physics of Semiconductors (Flagstaff, July 2004) edited by J. Menendez and C. Van de Walle (American Institute of Physics Conference Proceedings)},
  year = 2005,
}