Automatic convexity of rank-1 convex functions

Bernd Kirchheim; Jan Kristensen

Comptes Rendus. Mathématique, Volume 349 (2011) p. 407-409

Non-differentiable functionals and singular sets of minima

Jan Kristensen; Giuseppe Mingione

Comptes Rendus. Mathématique, Volume 340 (2005) p. 93-98