@Misc{ 
  HasMül14,
  author = { Haslhofer, Robert and Müller, Reto },
  title = { A note on the compactness theorem for 4d Ricci shrinkers },
  journal = {  },
  year = { 2014 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2502/ },
  note = { cvgmt preprint}
}