@Article{ braglo06, author = { Braides, Andrea and Gloria, Antoine }, title = { Exact bounds on the effective behaviour of a conducting `discrete' polycrystal }, journal = { Multiscale Modeling and Simulation }, year = { 2007 }, volume = { 6 }, pages = { 1198-1216 }, URL = { http://cvgmt.sns.it/paper/1175/ }, note = { cvgmt preprint} }