@Article{ 
  CaCaMaMa14,
  author = { Cao, Huai-Dong and Catino, Giovanni and Chen, Qiang and Mantegazza, Carlo and Mazzieri, Lorenzo },
  title = { Bach-flat gradient steady Ricci solitons },
  journal = { Calc. Var. Partial Differential Equations },
  year = { 2014 },
  doi = { 10.1007/s00526-012-0575-3 },
  volume = { 49 },
  number = { 1-2 },
  pages = { 125-138 },
  URL = { https://gecogedi.dimai.unifi.it/paper/55/ },
  note = { cvgmt preprint}
}