@Article{ 
  sig,
  author = { Sigalotti, Laura },
  title = { Asymptotic analysis of periodically perforated nonlinear media at the critical exponent },
  journal = { Comm. Cont. Math. },
  year = { 2009 },
  volume = { 11 },
  number = { 6 },
  pages = { 1009-1033 },
  URL = { http://cvgmt.sns.it/paper/548/ },
  note = { cvgmt preprint}
}