@Article{ 
  gozmonves02,
  author = { Gozzi, Fausto and Monte, Roberto and Vespri, Vincenzo },
  title = { Generation of analytic semigroups for degenerate elliptic operators arising in financial mathematics },
  journal = { Diff. Int Equations },
  year = { 2002 },
  number = { 15 },
  pages = { 1085-1128 },
  URL = { http://cvgmt.sns.it/paper/454/ },
  note = { cvgmt preprint}
}