@Misc{ 
  OgnVel24,
  author = { Ognibene, Roberto and Velichkov, Bozhidar },
  title = { Boundary regularity of the free interface in spectral optimal partition
  problems },
  journal = {  },
  year = { 2024 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/6514/ },
  note = { cvgmt preprint}
}