The structure of cobalt nanoparticles on Ge(001) K. Sell, A. Kleibert, V. v. Oeynhausen and K.-H. Meiwes-Broer Eur. Phys. J. D, 45 3 (2007) 433-437 Published online: 27 June 2007 DOI: 10.1140/epjd/e2007-00213-7