Reference:
Taneli Mielikainen and Heikki Mannila. The pattern ordering problem. In PKDD 2003, pages 327–338, 2003.
Suggested BibTeX entry:
@inproceedings{mielikainenmannila03, author = {Taneli Mielikainen and Heikki Mannila}, booktitle = {PKDD 2003}, pages = {327-338}, title = {The Pattern Ordering Problem}, year = {2003}, }