@Misc{ 
  boubut00,
  author = { Bouchitté, Guy and Buttazzo, Giuseppe },
  title = { Characterization of Optimal Shapes and Masses through Monge-Kantorovich Equation },
  journal = {  },
  year = { 2000 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/267/ },
  note = { cvgmt preprint}
}