Free vibration analysis of a rotating nanoshaft based SWCNT Abdelkadir Belhadj, Abdelkrim Boukhalfa and Sid A. Belalia Eur. Phys. J. Plus, 132 12 (2017) 513 Published online: 08 December 2017 DOI: 10.1140/epjp/i2017-11783-2