Luca Cabibbo Riccardo Torlone The Design and Development of a Logical System for OLAP. 1-10 http://link.springer.de/link/service/series/0558/bibs/1874/18740001.htm 2000 conf/dawak/2000 DaWaK db/conf/dawak/dawak2000.html#CabibboT00