First-principle study of magnetism induced by vacancies in graphene X. Q. Dai, J. H. Zhao, M. H. Xie, Y. N. Tang, Y. H. Li and B. Zhao Eur. Phys. J. B, 80 3 (2011) 343-349 Published online: 18 March 2011 DOI: 10.1140/epjb/e2011-10955-x