@Article{ 
  mon02,
  author = { Monti, Roberto },
  title = { Brunn-Minkowski and isoperimetric inequality in the Heisenberg group },
  journal = { Ann. Acad. Sci. Fenn. Math. },
  year = { 2003 },
  volume = { 28 },
  pages = { 99-109 },
  URL = { http://cvgmt.sns.it/paper/947/ },
  note = { cvgmt preprint}
}