Chuan Duan Jane Cleland-Huang Bamshad Mobasher A consensus based approach to constrained clustering of software requirements. 1073-1082 2008 CIKM http://doi.acm.org/10.1145/1458082.1458225 conf/cikm/2008 db/conf/cikm/cikm2008.html#DuanCM08