@Misc{ 
  PerSqu16,
  author = { Perera, Kanishka and Squassina, Marco },
  title = { Existence results for double phase problems via Morse Theory },
  journal = { Comm. Contemporary Math. },
  year = { 2016 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3231/ },
  note = { cvgmt preprint}
}