Julian Dolby Achille Fokoue Aditya Kalyanpur Li Ma Edith Schonberg Kavitha Srinivas Xingzhi Sun Scalable Grounded Conjunctive Query Evaluation over Large and Expressive Knowledge Bases. 403-418 2008 International Semantic Web Conference http://dx.doi.org/10.1007/978-3-540-88564-1_26 conf/semweb/2008 db/conf/semweb/iswc2008.html#DolbyFKMSSS08