@Article{ del, author = { De Lellis, Camillo }, title = { An example in the gradient theory of phase transitions }, journal = { Control, Optimisation and Calculus of Variations }, year = { 2002 }, volume = { 7 }, number = { 12 }, pages = { 285-289 }, URL = { http://cvgmt.sns.it/paper/1611/ }, note = { cvgmt preprint} }