@Misc{ 
  figkimmcc10,
  author = { Figalli, Alessio and Kim, Young-Heon and McCann, Robert J. },
  title = { When is multidimensional screening a convex program? },
  journal = { J. Econom. Theory },
  year = { 2010 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/809/ },
  note = { cvgmt preprint}
}