Thanh Tran Haofen Wang Sebastian Rudolph Philipp Cimiano Top-k Exploration of Query Candidates for Efficient Keyword Search on Graph-Shaped (RDF) Data. 405-416 2009 ICDE http://dx.doi.org/10.1109/ICDE.2009.119 conf/icde/2009 db/conf/icde/icde2009.html#TranWRC09