@Article{ 
  tredal00,
  author = { Dal Maso, Gianni and Trebeschi, Paola },
  title = { $\Gamma$-limit of Periodic Obstacles },
  journal = { Acta Appl. Math. },
  year = { 2001 },
  volume = { 65 },
  pages = { 207-215 },
  URL = { http://cvgmt.sns.it/paper/968/ },
  note = { cvgmt preprint}
}