Spin-orbit effects in carbon nanotubes – Analytical results Konstantin Nikolaevich Pichugin, Mihal Pudlak and Rashid Giyasovich Nazmitdinov Eur. Phys. J. B, 87 6 (2014) 124 Published online: 02 June 2014 DOI: 10.1140/epjb/e2014-50076-6