@Misc{ 
  BriButPri20,
  author = { Briani, L. and Buttazzo, G. and Prinari, F. },
  title = { Some inequalities involving perimeter and torsional rigidity },
  journal = {  },
  year = { 2020 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4731/ },
  note = { cvgmt preprint}
}