Christos H. Papadimitriou Mihalis Yannakakis Multiobjective Query Optimization. 2001 conf/pods/2001 PODS db/conf/pods/pods2001.html#PapadimitriouY01 http://doi.acm.org/10.1145/375551.375560 http://www.acm.org/sigs/sigmod/pods/proc01/online/p35.pdf