@Misc{ 
  GavPis24,
  author = { Gavitone, Nunzia and Piscitelli, Gianpaolo },
  title = { An isoperimetric inequality for the first Robin-Dirichlet eigenvalue of
  the Laplacian },
  journal = {  },
  year = { 2024 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/6538/ },
  note = { cvgmt preprint}
}