@Article{ 
  beldempre,
  author = { Bellettini, Giovanni and De Masi, Anna and Presutti, Errico },
  title = { Tunnelling in nonlocal evolution equations },
  journal = { J. Nonlin. Math. Phys. },
  year = { 2005 },
  volume = { 12 },
  number = { 1 },
  pages = { 50-63 },
  URL = { http://cvgmt.sns.it/paper/1035/ },
  note = { cvgmt preprint}
}