Mean-free path effects in magnetoresistance of ferromagnetic nanocontacts A. N. Useinov, L. R. Tagirov, R. G. Deminov, Y. Zhou and G. Pan Eur. Phys. J. B, 60 2 (2007) 187-192 Published online: 08 December 2007 DOI: 10.1140/epjb/e2007-00335-8