@Article{ 
  MonRiv12,
  author = { Mondino, Andrea and Rivière, Tristan },
  title = { Willmore Spheres in Compact Riemannian Manifolds },
  journal = { Advances in Math. },
  year = { 2012 },
  pages = { 58 },
  URL = { http://cvgmt.sns.it/paper/1920/ },
  note = { cvgmt preprint}
}