@Misc{ 
  BiaBraOgn23,
  author = { Bianchi, Francesca and Brasco, Lorenzo and Ognibene, Roberto },
  title = { On the spectrum of sets made of cores and tubes },
  journal = { J. Convex Anal. },
  year = { 2023 },
  pages = { 42 },
  URL = { http://cvgmt.sns.it/paper/6105/ },
  note = { cvgmt preprint}
}