Sara Cohen. User-defined aggregate functions: bridging theory and practice. In Surajit Chaudhuri, Vagelis Hristidis, Neoklis Polyzotis, editors, Proceedings of the ACM SIGMOD International Conference on Management of Data, Chicago, Illinois, USA, June 27-29, 2006. pages 49-60, ACM, 2006. [doi]
Abstract is missing.