Hydrodynamic interactions in self similar structures, such as polymers P. Dommersnes, S. Straumsnes, E. G. Flekkøy, T. Nicolai and S. Roux Eur. Phys. J. B, 9 4 (1999) 669-677 Published online: 15 June 1999 DOI: 10.1007/s100510050811