@Article{ dacmarpao, author = { Dacorogna, Bernard and Marcellini, Paolo and Paolini, Emanuele }, title = { Lipschitz-continuous local isometric immersions: rigid maps and origami }, journal = { J. Math. Pures Appl. }, year = { 2008 }, volume = { 90 }, number = { 1 }, pages = { 66-81 }, URL = { http://cvgmt.sns.it/paper/895/ }, note = { cvgmt preprint} }