@Article{ 
  JerNovOrl12,
  author = { Jerrard, Robert L. and Novaga, Matteo and Orlandi, Giandomenico },
  title = { On the regularity of timelike extremal surfaces },
  journal = { Comm. Contemp. Math. },
  year = { 2015 },
  volume = { 17 },
  number = { 1 },
  pages = { 19 pages },
  URL = { http://cvgmt.sns.it/paper/2027/ },
  note = { cvgmt preprint}
}