@Article{ 
  DeL10a,
  author = { De Lellis, Camillo },
  title = { Almgren's $Q$-valued functions revisited },
  journal = { Proceedings of the International Congress of Mathematicians.  },
  year = { 2010 },
  volume = { III },
  pages = { 1910-1933 },
  URL = { http://cvgmt.sns.it/paper/2191/ },
  note = { cvgmt preprint}
}