@BOOK { Rsds2353,
title = {Rough Sets in Knowledge Discovery 1: Methodology and Applications}, 
series =  = {Studies in Fuzziness and Soft Computing, Vol. 18}, 
publisher = {Physica-Verlag}, 
address = {Heidelberg, Germany}, 
year = 1998, 
editor = {Polkowski, Lech and Skowron, Andrzej}, 
url = {http://www.springer.de}, 
isbn = {3-7908-1119-X}, 
keywords = {artificial intelligence, data mining, knowledge discovery, rough sets, rough mereology, }, 
}