Probing viscosity of a polymer melt at the nanometre scale with an oscillating nanotip F. Dubourg, J.P. Aimé, S. Marsaudon, R. Boisgard and P. Leclère Eur. Phys. J. E, 6 1 (2001) 49-55 Published online: 15 September 2001 DOI: 10.1007/s101890170027