http://www.vldb.org/conf/2003/papers/S29P01.pdf Bishwaranjan Bhattacharjee Sriram Padmanabhan Timothy Malkemus Tony Lai Leslie Cranston Matthew Huras Efficient Query Processing for Multi-Dimensionally Clustered Tables in DB2. 2003 VLDB db/conf/vldb/vldb2003.html#BhattacharjeePMLCH03 963-974