@Misc{ 
  Mod17,
  author = { Modena, Stefano },
  title = { A "forward-in-time" quadratic potential for systems of conservation laws },
  journal = { Nonlinear Differential Equations and Applications },
  year = { 2017 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3300/ },
  note = { cvgmt preprint}
}