@Misc{ 
  BucMarNah22,
  author = { Bucur, Dorin and Martinet, Eloi and Nahon, Mickael },
  title = { Sharp inequalities for Neumann eigenvalues on the sphere },
  journal = {  },
  year = { 2022 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5694/ },
  note = { cvgmt preprint}
}