@Misc{ NesPalPon11, author = { Nesi, Vincenzo and Palombaro, Mariapia and Ponsiglione, Marcello }, title = { Gradient integrability and rigidity results for two-phase conductivities in dimension two }, journal = { }, year = { 2011 }, pages = { }, URL = { http://cvgmt.sns.it/paper/1724/ }, note = { cvgmt preprint} }