@Article{ 
  DiM19,
  author = { Di Matteo, Gianmichele },
  title = { Nondegeneracy of standard double bubbles },
  journal = { Proceedings of the American Mathematical Society },
  year = { 2019 },
  doi = { https://doi.org/10.1090/proc/14551 },
  volume = { 147 },
  pages = { 4379-4395 },
  URL = { http://cvgmt.sns.it/paper/4805/ },
  note = { cvgmt preprint}
}