@Misc{ 
  CaMaDaPu18,
  author = { Catino, Giovanni and Dario D. Monticelli,  and Mastrolia, Paolo and Punzo, Fabio },
  title = { Four dimensional closed manifolds admit a weak harmonic Weyl metric },
  journal = {  },
  year = { 2018 },
  pages = {  },
  URL = { https://gecogedi.dimai.unifi.it/paper/520/ },
  note = { cvgmt preprint}
}