Log-periodic oscillations for biased diffusion of a polymer chain in a porous medium V. Yamakov, A. Milchev, G. M. Foo, R. B. Pandey and D. Stauffer Eur. Phys. J. B, 9 4 (1999) 659-667 Published online: 15 June 1999 DOI: 10.1007/s100510050810