Catriel Beeri Phokion G. Kolaitis Christos H. Papadimitriou The ACM PODS Alberto O. Mendelzon test-of-time-award 2009. 43 2009 PODS http://doi.acm.org/10.1145/1559795.1559803 conf/pods/2009 db/conf/pods/pods2009.html#BeeriKP09