@Misc{ 
  dan01,
  author = { Danielli, Donatella },
  title = { A singular perturbation approach to a two phase parabolic free boundary problem arising in combustion theory },
  journal = {  },
  year = { 2002 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/931/ },
  note = { cvgmt preprint}
}