Osmar R. Zaïane Andrew Foss Chi-Hoon Lee Weinan Wang On Data Clustering Analysis: Scalability, Constraints, and Validation. 28-39 2002 conf/pakdd/2002 PAKDD http://link.springer.de/link/service/series/0558/bibs/2336/23360028.htm db/conf/pakdd/pakdd2002.html#ZaianeFLW02