@Misc{ 
  San23a,
  author = { Santambrogio, Filippo },
  title = { A course in the Calculus of Variations },
  journal = {  },
  year = { 2023 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/6339/ },
  note = { cvgmt preprint}
}