@Misc{ 
  ciafus03,
  author = { Cianchi, Andrea and Fusco, Nicola },
  title = { Steiner symmetric extremals in Polya-Szego type inequalities },
  journal = {  },
  year = { 2003 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1482/ },
  note = { cvgmt preprint}
}