@Article{ 
  Ber21,
  author = { Bernardini, Chiara },
  title = { Existence and asymptotic behavior of non-normal conformal metrics on  $\mathbb{R}^4$ with sign-changing $Q$-curvature },
  journal = { Communications in Contemporary Mathematics },
  year = { 2022 },
  doi = { 10.1142/S0219199722500535 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5816/ },
  note = { cvgmt preprint}
}