Franck Ravat Olivier Teste Ronan Tournier Gilles Zurfluh Algebraic and Graphic Languages for OLAP Manipulations. 17-46 2008 4 IJDWM 1 http://www.igi-pub.com/articles/details.asp?ID=7703 db/journals/jdwm/ijdwm4.html#RavatTTZ08