@Misc{ 
  BucGia15,
  author = { Bucur, Dorin and Giacomini, Alessandro },
  title = { Shape optimization problems with Robin  conditions on the free boundary },
  journal = { Ann. Inst. H. Poincaré Anal. Non Linéaire },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2609/ },
  note = { cvgmt preprint}
}