@Article{ 
  del99,
  author = { Delladio, Silvano },
  title = { Generalized Unit Normal Bundles },
  journal = { Math. Z. },
  year = { 2001 },
  volume = { 236 },
  pages = { 223-249 },
  URL = { http://cvgmt.sns.it/paper/1266/ },
  note = { cvgmt preprint}
}