@Article{ 
  men02,
  author = { Mennucci, Andrea C. G. },
  title = { Regularity and Variationality of Solutions to Hamilton-Jacobi Equations. part I: regularity },
  journal = { ESAIM COCV },
  year = { 2003 },
  doi = { 10.1051/cocv:2004014 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/179/ },
  note = { cvgmt preprint}
}