@Article{ 
  RusTreVel19,
  author = { Russ, Emmanuel and Trey, Baptiste and Velichkov, Bozhidar },
  title = { Existence and regularity of optimal shapes for elliptic operators with drift },
  journal = { Calc. Var. PDE },
  year = { 2019 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4511/ },
  note = { cvgmt preprint}
}