Agnar Aamodt Mads Nygård Different Roles and Mutual Dependencies of Data, Information, and Knowledge - An AI Perspective on their Integration. 191-222 1995 16 Data Knowl. Eng. 3 db/journals/dke/dke16.html#AamodtN95 http://dx.doi.org/10.1016/0169-023X(95)00017-M