Matthias Jarke Manfred A. Jeusfeld Hans W. Nissen Christoph Quix Heterogeneity in Model Management: A Meta Modeling Approach. 237-253 2009 Conceptual Modeling: Foundations and Applications http://dx.doi.org/10.1007/978-3-642-02463-4_13 conf/birthday/2009mylopoulos db/conf/birthday/mylopoulos2009.html#JarkeJNQ09