Chi-Yuen Ng Joseph Lee Felix Cheung Ben Kao David Wai-Lok Cheung Efficient Algorithms for Concept Space Construction. 90-101 2001 conf/pakdd/2001 PAKDD http://link.springer.de/link/service/series/0558/bibs/2035/20350090.htm db/conf/pakdd/pakdd2001.html#NgLCKC01