@Article{ 
  col,
  author = { Colombo, Fabrizio },
  title = { An inverse problem for a generalized Kermack-McKendrick model },
  journal = { J. Inverse and Ill-posed Problems },
  year = { 2002 },
  volume = { 10 },
  pages = { 221-241 },
  URL = { http://cvgmt.sns.it/paper/241/ },
  note = { cvgmt preprint}
}