@Article{ 
  giamuc02,
  author = { Giaquinta, Mariano and Mucci, Domenico },
  title = { Weak and strong density results for the Dirichlet energy },
  journal = { Jour. Eur. Math. Soc. },
  year = { 2004 },
  volume = { 6 },
  pages = { 95-117 },
  URL = { http://cvgmt.sns.it/paper/1567/ },
  note = { cvgmt preprint}
}