Variable-range hopping in Fe70Pt30 catalyzed multi-walled carbon nanotubes film M. Aggarwal, S. Khan, M. Husain, T. C. Ming, M. Y. Tsai, T. P. Perng and Z. H. Khan Eur. Phys. J. B, 60 3 (2007) 319-324 Published online: 22 December 2007 DOI: 10.1140/epjb/e2007-00348-3