@Article{ 
  CatMaz12,
  author = { Catino, Giovanni and Mazzieri, Lorenzo },
  title = { Gradient Einstein solitons },
  journal = { Nonlinear Anal. },
  year = { 2016 },
  volume = { 132 },
  pages = { 66-94 },
  URL = { http://cvgmt.sns.it/paper/1750/ },
  note = { cvgmt preprint}
}