Electrical transport properties of percolating random networks of carbon nanotube bundles S. Seppälä, E. Häkkinen, M. J. Alava, V. Ermolov and E. T. Seppälä EPL, 91 4 (2010) 47002 Published online: 02 September 2010 DOI: 10.1209/0295-5075/91/47002