@Article{ cupmas05, author = { Cupini, Giovanni and Mascolo, Elvira }, title = { Existence of minimizers for polyconvex and nonpolyconvex problems }, journal = { SIAM J. Control Optim. }, year = { 2005 }, volume = { 44 }, number = { 4 }, pages = { 1370-1390 }, URL = { http://cvgmt.sns.it/paper/432/ }, note = { cvgmt preprint} }