@Misc{ 
  DelPis22,
  author = { Della Pietra, Francesco and Piscitelli, Gianpaolo },
  title = { Sharp estimates for the first Robin eigenvalue of nonlinear elliptic
  operators },
  journal = {  },
  year = { 2022 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5725/ },
  note = { cvgmt preprint}
}