Ramanathan Balachandran Srihari Padmanabhan Sharma Chakravarthy Enhanced DB-Subdue: Supporting Subtle Aspects of Graph Mining Using a Relational Approach. 673-678 2006 conf/pakdd/2006 PAKDD http://dx.doi.org/10.1007/11731139_77 db/conf/pakdd/pakdd2006.html#BalachandranPC06