Ravindra Guravannavar S. Sudarshan 0001 Reducing Order Enforcement Cost in Complex Query Plans. 856-865 2007 conf/icde/2007 ICDE http://doi.ieeecomputersociety.org/10.1109/ICDE.2007.367931 db/conf/icde/icde2007.html#GuravannavarS07