Joaquim Filipe Yannis Manolopoulos Foreword for the DKE special issue with selected papers from the 8th International Conference on Enterprise Information Systems (ICEIS' 2006). 75-76 2008 64 Data Knowl. Eng. 1 http://dx.doi.org/10.1016/j.datak.2007.06.017 db/journals/dke/dke64.html#FilipeM08