The effect of oxidation on the structure of nickel nanoparticles B. Rellinghaus, S. Stappert, E. F. Wassermann, H. Sauer and B. Spliethoff Eur. Phys. J. D, 16 1-3 (2001) 249-252 Published online: 15 September 2001 DOI: 10.1007/s100530170103