Reference:

Aristides Gionis, Heikki Mannila, Kai Puolamäki, and Antti Ukkonen. Algorithms for discovering bucket orders from data. In Proceedings of the 12th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining (KDD '06), pages 561–566, New York, NY, USA, 2006. ACM.

Suggested BibTeX entry:

@inproceedings{Gionis06kdd,
    address = {New York, NY, USA},
    author = {Aristides Gionis and Heikki Mannila and Kai Puolam\"aki and Antti Ukkonen},
    booktitle = {Proceedings of the 12th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining (KDD '06)},
    pages = {561--566},
    publisher = {ACM},
    title = {Algorithms for discovering bucket orders from data},
    year = {2006},
}