Surface and quantum-size effects on the specific heat of layered and nonlayered nanotubes Y. Xiao, X. H. Yan, D. L. Wang and Y. Zhang Eur. Phys. J. B, 66 4 (2008) 433-438 Published online: 09 December 2008 DOI: 10.1140/epjb/e2008-00447-7