Lower and upper bounds for the Rayleigh conductivity of a perforated plate S. Laurens, S. Tordeux, A. Bendali, M. Fares and P.R. Kotiuga ESAIM: M2AN, 47 6 (2013) 1691-1712 Published online: 11 October 2013 DOI: 10.1051/m2an/2013082