Theoretical study of small silicon clusters on a graphite layer F. Hagelberg, C. Xiao, B. Marsen, M. Lonfat, P. Scheier and K. Sattler Eur. Phys. J. D, 16 1-3 (2001) 37-41 Published online: 15 September 2001 DOI: 10.1007/s100530170055