Hoda Mokhtar Jianwen Su Oscar H. Ibarra 188-198 2002 conf/pods/2002 PODS http://doi.acm.org/10.1145/543613.543638 http://www.acm.org/sigs/sigmod/pods/proc02/papers/188-MokhtarSI.pdf db/conf/pods/pods02.html#MokhtarSI02