Ab initio study on the adsorption of oxygen on Co(111) and its subsurface incorporation S.H. Ma, Z.Y. Jiao, T.X. Wang and X.Q. Dai Eur. Phys. J. B, 88 1 (2015) 4 Published online: 02 January 2015 DOI: 10.1140/epjb/e2014-50292-0