4. T. Schiros, H. Ogasawara, L. Naslund, K. J. Andersson, J. Ren, S. Meng, G. S. Karlberg, M. Odelius, A. Nilssona, L.G.M. Pettersson, Cooperativity in surface bonding and hydrogen bonding of water and hydroxyl at metal surfaces, JOURNAL of PHYSICAL CHEMISTRY C 114, 10240 (2010).