@Article{ 
  del01a,
  author = { Delladio, Silvano },
  title = { First variation formula for generalized Gauss graphs },
  journal = { Ann. Mat. Pura ed Appl.  },
  year = { 2001 },
  volume = { CLXXIX },
  pages = { 17-37 },
  URL = { http://cvgmt.sns.it/paper/742/ },
  note = { cvgmt preprint}
}