@Article{ 
  brasig09,
  author = { Braides, Andrea and Sigalotti, Laura },
  title = { Models of defects in atomistic systems },
  journal = { Calc. Var. Partial Diff. Eq. },
  year = { 2011 },
  volume = { 41 },
  pages = { 71-109 },
  URL = { http://cvgmt.sns.it/paper/785/ },
  note = { cvgmt preprint}
}