Nicola Guarino Giancarlo Guizzardi In the Defense of Ontological Foundations for Conceptual Modelling. 2006 18 Scandinavian J. Inf. Systems 1 http://www.e-sjis.org/journal/volumes/volume18/articles/SJIS%2018(1).book(05%20Guarino%20and%20Guizzardi%20-%20Response.pdf db/journals/sjis/sjis18.html#GuarinoG06