Electronic structure of diamond/graphite composite nanoparticles A. V. Okotrub, L. G. Bulusheva, V. L. Kuznetsov, D. V. Vyalikh and M. V. Poyguin Eur. Phys. J. D, 34 1-3 (2005) 157-160 Published online: 13 July 2005 DOI: 10.1140/epjd/e2005-00136-3