@Article{ 
  BetMar19,
  author = { Bettiol, Piernicola and Mariconda, Carlo },
  title = { On a new necessary condition in the Calculus of Variations for Lagrangians that are highly discontinuous in the state and velocity },
  journal = { Atti Accad. Naz. Lincei Rend. Lincei Mat. Appl. },
  year = { 2019 },
  doi = { 10.4171/RLM/865 },
  volume = { 30 },
  number = { 3 },
  pages = { 649-663 },
  URL = { http://cvgmt.sns.it/paper/4456/ },
  note = { cvgmt preprint}
}