Gjergji Kasneci Maya Ramanath Mauro Sozio Fabian M. Suchanek Gerhard Weikum STAR: Steiner-Tree Approximation in Relationship Graphs. 868-879 2009 ICDE http://dx.doi.org/10.1109/ICDE.2009.64 conf/icde/2009 db/conf/icde/icde2009.html#KasneciRSSW09