Can one hear the shape of an electrode? I. Numerical study of the active zone in Laplacian transfer B. Sapoval, M. Filoche, K. Karamanos and R. Brizzi Eur. Phys. J. B, 9 4 (1999) 739-753 Published online: 15 June 1999 DOI: 10.1007/s100510050819