Electron transport in graphene nanoribbons under a central potential modulation Y. E. Xie, Y. P. Chen, X. L. Wei, Y. Tang, J. W. Ding and J. X. Zhong Eur. Phys. J. B, 78 3 (2010) 381-385 Published online: 17 November 2010 DOI: 10.1140/epjb/e2010-10338-y