Numerical implementation of the asymptotic theory for classical diffusion in heterogeneous media Peter S. Kondratenko, Alexander L. Matveev and Alexander D. Vasiliev Eur. Phys. J. B, 94 2 (2021) 50 Published online: 08 February 2021 DOI: 10.1140/epjb/s10051-020-00021-7