Electron waves in chemically substituted graphene N. M. R. Peres, F. D. Klironomos, S.-W. Tsai, J. R. Santos, J. M. B. Lopes dos Santos and A. H. Castro Neto EPL, 80 6 (2007) 67007 Published online: 13 November 2007 DOI: 10.1209/0295-5075/80/67007