Mario Ornaghi Camillo Fiorentini Alberto Momigliano Francesco Pagano Applying ASP to UML Model Validation. 457-463 2009 LPNMR http://dx.doi.org/10.1007/978-3-642-04238-6_42 conf/lpnmr/2009 db/conf/lpnmr/lpnmr2009.html#OrnaghiFMP09