@Article{ 
  BraFra14,
  author = { Brasco, Lorenzo and Franzina, Giovanni },
  title = { Convexity properties of Dirichlet integrals and Picone-type inequalities },
  journal = { Kodai Math. J. },
  year = { 2014 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2376/ },
  note = { cvgmt preprint}
}