Massimo Franceschet Donatella Gubiani Angelo Montanari Carla Piazza From Entity Relationship to XML Schema: A Graph-Theoretic Approach. 165-179 2009 XSym http://dx.doi.org/10.1007/978-3-642-03555-5_14 conf/xsym/2009 db/conf/xsym/xsym2009.html#FranceschetGMP09