@Article{ 
  Ste16,
  author = { Stefani, Giorgio },
  title = { On the monotonicity of perimeter of convex bodies },
  journal = { J. Convex Anal. },
  year = { 2018 },
  volume = { 25 },
  number = { 1 },
  pages = { 93--102 },
  URL = { http://cvgmt.sns.it/paper/3249/ },
  note = { cvgmt preprint}
}