@Misc{ 
  gor,
  author = { Gori, Michele },
  title = { On a maximization problem for the convex hull of connected systems of segments },
  journal = { Journal of Convex Analysis },
  year = { 2007 },
  volume = { 14 },
  number = { 1 },
  pages = { 49-68 },
  URL = { http://cvgmt.sns.it/paper/379/ },
  note = { cvgmt preprint}
}