Alessandro Artale Jean Paul Ballerini Filippo Cacace Stefano Ceri Francesca Cesarini Anna Formica Herman Lam Sergio Greco G. Marrella Michele Missikoff Luigi Palopoli L. Pichetti Domenico Saccà Silvio Salza Claudio Sartori Giovanni Soda Letizia Tanca M. Toiati Prototypes in the LOGIDATA+ Project. 252-273 1993 books/sp/Atzeni93 LOGIDATA+: Deductive Databases with Complex Objects db/journals/lncs/lncs701.html#ArtaleBCCCFLGMM93