@Article{ confarmag, author = { Conti, Sergio and Faraco, Daniel and Maggi, Francesco }, title = { A new approach to counterexamples to $L^1$ estimates: Korn's inequality, geometric rigidity and regularity for gradients of separately convex functions }, journal = { Arch. Ration. Mech. Anal. }, year = { 2005 }, volume = { 175 }, number = { 2 }, pages = { 287-300 }, URL = { http://cvgmt.sns.it/paper/480/ }, note = { cvgmt preprint} }