Hydrogen adsorption on graphene: a first principles study V. V. Ivanovskaya, A. Zobelli, D. Teillet-Billy, N. Rougeau, V. Sidis and P. R. Briddon Eur. Phys. J. B, 76 3 (2010) 481-486 Published online: 03 August 2010 DOI: 10.1140/epjb/e2010-00238-7