@Article{ 
  PraSar19,
  author = { Pratelli, Aldo and Saracco, Giorgio },
  title = { The $\varepsilon-\varepsilon^\beta$ property in the isoperimetric problem with double density, and the regularity of isoperimetric sets },
  journal = { Adv. Nonlinear Stud. },
  year = { 2020 },
  doi = { 10.1515/ans-2020-2074 },
  volume = { 20 },
  number = { 3 },
  pages = { 539--555 },
  URL = { http://cvgmt.sns.it/paper/4495/ },
  note = { cvgmt preprint}
}