Nick Roussopoulos Dimitris Karagiannis Conceptual Modeling: Past, Present and the Continuum of the Future. 139-152 2009 Conceptual Modeling: Foundations and Applications http://dx.doi.org/10.1007/978-3-642-02463-4_9 conf/birthday/2009mylopoulos db/conf/birthday/mylopoulos2009.html#RoussopoulosK09