@Article{ 
  dacfer,
  author = { Dacorogna, Bernard and Ferriero, Alessandro },
  title = { Regularity and selecting principles for Implicit ODEs },
  journal = { Discrete Cont. Dyn. Syst. Ser. B },
  year = { 2009 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/542/ },
  note = { cvgmt preprint}
}