Prototypes in the LOGIDATA+ Project. - Alessandro Artale; Jean Paul Ballerini; Filippo Cacace; Stefano Ceri; Francesca Cesarini; Anna Formica; Herman Lam; Sergio Greco; Giorgio Marrella; Michele Missikoff; Luigi Palopoli 001; Luigi Pichetti; et al. (LOGIDATA+: Deductive Databases with Complex Objects, 1993)