@Misc{ 
  colgiuves,
  author = { Colombo, Fabrizio and Giuli, Massimiliano and Vespri, Vincenzo },
  title = { A Semigroup Approach to No-Arbitrage Pricing Theory: Constant Elasticity Variance Model and TermStructure Models },
  journal = { Proceeding of ''Evolution Equations 2000'' },
  year = { 2002 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/16/ },
  note = { cvgmt preprint}
}