Adsorption of O and CO on Ir(100) from first principles I. A. Erikat, B. A. Hamad and J. M. Khalifeh Eur. Phys. J. B, 67 1 (2009) 35-41 Published online: 24 December 2008 DOI: 10.1140/epjb/e2008-00471-7