@Misc{ 
  Rio18b,
  author = { Rios-Zertuche, Rodolfo },
  title = { Characterization of minimizable Lagrangian action functionals and a dual
  Mather theorem },
  journal = {  },
  year = { 2018 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4216/ },
  note = { cvgmt preprint}
}