@Misc{ 
  PaoPisTra19,
  author = { Paoli, Gloria and Piscitelli, Gianpaolo and Trani, Leonardo },
  title = { Sharp estimates for the first $p$-Laplacian eigenvalue and for the
  $p$-torsional rigidity on convex sets with holes },
  journal = {  },
  year = { 2019 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5702/ },
  note = { cvgmt preprint}
}