http://doi.acm.org/10.1145/248603.248616 db/journals/sigmod/ChaudhuriD97.html Surajit Chaudhuri Umeshwar Dayal An Overview of Data Warehousing and OLAP Technology. 65-74 sigmodR/26-1/P065.pdf 1997 26 SIGMOD Record 1 db/journals/sigmod/sigmod26.html#ChaudhuriD97 http://www.acm.org/sigmod/record/issues/9703/chaudhuri.ps