@Misc{ 
  ColSpoVel17,
  author = { Colombo, Maria and Spolaor, Luca and Velichkov, Bozhidar },
  title = { A logarithmic epiperimetric inequality for the obstacle problem },
  journal = { Geom. Funct. Anal. },
  year = { 2017 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3541/ },
  note = { cvgmt preprint}
}