@Article{ 
  Ler12,
  author = { Lerario, Antonio },
  title = { Convex pencils of real quadratic forms },
  journal = { Discrete and Computational Geometry },
  year = { 2012 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2869/ },
  note = { cvgmt preprint}
}