@Misc{ 
  FigSha15,
  author = { Figalli, Alessio and Shahgholian, Henrik },
  title = { An overview of unconstrained free boundary problems },
  journal = { Philos. Trans. R. Soc. Lond. Ser. A Math. Phys. Eng. Sci. },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2614/ },
  note = { cvgmt preprint}
}