Nanofriction studies of reactively or non-reactively cluster-eroded single crystal diamond R. Krämer, Y. Yamaguchi and J. Gspann Eur. Phys. J. D, 34 1-3 (2005) 235-238 Published online: 13 July 2005 DOI: 10.1140/epjd/e2005-00150-5