@misc{GuizzardiWagnerAlmeidaetal., author = {Guizzardi, Giancarlo and Wagner, Gerd and Almeida, Jo{\~a}o Paulo Andrade and Guizzardi, Renata}, title = {Towards Ontological Foundation for Conceptual Modeling: The Unified Foundationa lOntology (UFO) Story}, series = {Applied Ontology}, volume = {10}, journal = {Applied Ontology}, number = {3-4}, issn = {1570-5838}, doi = {10.3233/AO-150157}, pages = {259 -- 271}, language = {en} }