Lila Shnaiderman Oded Shmueli Rajesh Bordawekar PIXSAR: incremental reclustering of augmented XML trees. 17-24 2008 WIDM http://doi.acm.org/10.1145/1458502.1458506 conf/widm/2008 db/conf/widm/widm2008.html#ShnaidermanSB08