@Article{ 
  nguvit,
  author = { Nguyen, Tien Khai and Vittone, Davide },
  title = { Rectifiability of special singularities of non-Lipschitz functions },
  journal = { J. Convex Anal. },
  year = { 2012 },
  volume = { 19 },
  number = { 1 },
  pages = { 159--170 },
  URL = { http://cvgmt.sns.it/paper/1257/ },
  note = { cvgmt preprint}
}