@Misc{ 
  Sap21,
  author = { Sapio, Francesco },
  title = { Dynamical models for viscoelastic materials in domains with a growing crack },
  journal = {  },
  year = { 2021 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5283/ },
  note = { cvgmt preprint}
}