Argon cluster impacts on layered silicon, silica, and graphite surfaces J. Samela, K. Nordlund, J. Keinonen, V. N. Popok and E. E.B. Campbell Eur. Phys. J. D, 43 1-3 (2007) 181-184 Published online: 24 May 2007 DOI: 10.1140/epjd/e2007-00104-y