with Ferrario, R. , 2012, 'Fondamenti ontologici per una scienza dei servizi', Rivista di estetica 49, 227-246.
, 2006a, Formal ontology, knowledge representation and conceptual modelling: old inspirations, still unsolved problems, in P. Hitzler & P. Øhrstrøm (eds.), Conceptual structures: inspiration and application, Dordrecht, Springer, pp. 1-1.