@Article{ 
  Mag12,
  author = { Magnani, Valentino and Rajala, Tapio },
  title = { Radon-Nikodym property and area formula for Banach homogeneous  group targets },
  journal = {  Int. Math. Res. Not. IMRN },
  year = { 2014 },
  volume = { 23 },
  pages = { 6399–6430 },
  URL = { http://cvgmt.sns.it/paper/1744/ },
  note = { cvgmt preprint}
}