@Article{ decleo, author = { De Cicco, Virginia and Leoni, Giovanni }, title = { A chain rule in $L^1(div;A)$ and its applications to lower semicontinuity }, journal = { Calc. Var. Partial Differential Equations }, year = { 2004 }, volume = { 19 }, number = { 1 }, pages = { 23-51 }, URL = { http://cvgmt.sns.it/paper/875/ }, note = { cvgmt preprint} }