Alberto Belussi Federica Liguori Jody Marca Giuseppe Pelagatti Mauro Negri Ownership Definition and Instances Integration in Highly Coupled Spatial Data Infrastructures. 379-399 2008 AGILE Conf. http://dx.doi.org/10.1007/978-3-540-78946-8_20 conf/agile/2008 db/conf/agile/agile2008.html#BelussiLMPN08