@Misc{ 
  HenZuc17a,
  author = { Henrot, Antoine and Zucco, Davide },
  title = { Optimizing the first Dirichlet eigenvalue of the Laplacian with an
  obstacle },
  journal = { Annali della Scuola Normale Superiore di Pisa },
  year = { 2018 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3328/ },
  note = { cvgmt preprint}
}