Curvature and external electric field effects on the persistent current in chiral toroidal carbon nanotubesN. Xu, J. W. Ding, H. B. Chen and M. M. MaEur. Phys. J. B, 67 1 (2009) 71-75DOI: https://doi.org/10.1140/epjb/e2009-00003-1