@Misc{ 
  Bra18a,
  author = { Brasco, Lorenzo },
  title = { On principal frequencies and inradius in convex sets },
  journal = { Bruno Pini Math. Anal. Semin. },
  year = { 2018 },
  pages = { 20 },
  URL = { http://cvgmt.sns.it/paper/4010/ },
  note = { cvgmt preprint}
}