@Article{ 
  BuzNgu15,
  author = { Buzano, Reto and Nguyen, Huy The },
  title = { The Chern-Gauss-Bonnet formula for singular non-compact four-dimensional  manifolds },
  journal = { Communications in Analysis and Geometry },
  year = { 2019 },
  doi = { 10.4310/CAG.2019.v27.n8.a2 },
  volume = { 27 },
  number = { 8 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3904/ },
  note = { cvgmt preprint}
}