@Misc{ 
  DiFMarZam10,
  author = { Di Fazio, Giuseppe and Maria Stella Fanciullo,  and Zamboni, Piero },
  title = { Harnack inequality and regularity for degenerate quasilinear elliptic
  equations },
  journal = {  },
  year = { 2010 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5288/ },
  note = { cvgmt preprint}
}