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