@inproceedings{ImpCigSco04,
  author = {Impoco, G. and Cignoni, P. and Scopigno, R.},
  title = {Closing Gaps by Clustering Unseen Directions},
  booktitle = {SMI 04 International Conference},
  month = {7-9 June},
  location = {Genova, Italy},
  year = {2004}
}