@Misc{ 
  Pet13,
  author = { Petrache, Mircea },
  title = { A singular radial connection over B⁵ minimizing the Yang-Mills energy },
  journal = {  },
  year = { 2013 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2306/ },
  note = { cvgmt preprint}
}