@Article{ 
  DeMaSpVa16,
  author = { De Lellis, Camillo and Marchese, Andrea and Spadaro, Emanuele and Valtorta, Daniele },
  title = { Rectifiability and upper Minkowski bounds for singularities of harmonic $Q$-valued maps },
  journal = { Comm. Math. Helv. },
  year = { 2018 },
  volume = { 93 },
  number = { 4 },
  pages = { 737-779 },
  URL = { http://cvgmt.sns.it/paper/3257/ },
  note = { cvgmt preprint}
}