@Article{ 
  SerTil12,
  author = { Serra, Enrico and Tilli, Paolo },
  title = { Nonlinear wave equations as limits of convex minimization problems: proof of a conjecture by De Giorgi },
  journal = { Annals of Mathematics },
  year = { 2012 },
  volume = { 175 },
  number = { 3 },
  pages = { 1551-1574 },
  URL = { http://cvgmt.sns.it/paper/2031/ },
  note = { cvgmt preprint}
}