@Misc{ GolMer19, author = { Goldman, Michael and Merlet, Benoit }, title = { Non-convex functionals penalizing simultaneous oscillations along independent directions: rigidity estimates }, journal = { Annali della SNS }, year = { 2020 }, pages = { }, URL = { http://cvgmt.sns.it/paper/4304/ }, note = { cvgmt preprint} }