John Krogstie Discussion on the Article "On Ontological Foundations of Conceptual Modelling". 2006 18 Scandinavian J. Inf. Systems 1 http://www.e-sjis.org/journal/volumes/volume18/articles/SJIS%2018(1).book(04%20Krogstie%20-%20Response.pdf db/journals/sjis/sjis18.html#Krogstie06