Eladio Domínguez Jorge Lloret Angel Luis Rubio María Antonia Zapata Evolving the Implementation of ISA Relationships in EER Schemas. 237-246 2006 conf/er/2006w ER (Workshops) http://dx.doi.org/10.1007/11908883_29 db/conf/er/erw2006.html#DominguezLRZ06