Willi Klösgen Deviation and Association Patterns for Subgroup Mining in Temporal, Spatial, and Textual Data Bases. 1-18 1998 conf/rsctc/1998 Rough Sets and Current Trends in Computing http://link.springer.de/link/service/series/0558/bibs/1424/14240001.htm db/conf/rsctc/rsctc1998.html#Klosgen98