Electronic structure of defects in a boron nitride monolayer S. Azevedo, J. R. Kaschny, C. M.C. de Castilho and F. de Brito Mota Eur. Phys. J. B, 67 4 (2009) 507-512 Published online: 14 February 2009 DOI: 10.1140/epjb/e2009-00043-5