@Article{ 
  MagMalMon15,
  author = { Magnani, Valentino and Malý, Jan and Mongodi, Samuele },
  title = { A low rank property and nonexistence of higher dimensional horizontal Sobolev sets },
  journal = { J. Geom. Anal. },
  year = { 2015 },
  doi = { 10.1007/s12220-014-9478-1 },
  volume = { 25 },
  number = { 3 },
  pages = { 1444-1458 },
  URL = { https://gecogedi.dimai.unifi.it/paper/242/ },
  note = { cvgmt preprint}
}