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A.  Brogi, Chiarelli, A., Mancarella, P., Mazzotta, V., Pedreschi, D., Renso, C., and Turini, F., ?Implementations of Program Composition Operations?, in PLILP, 1994, pp. 292-307.

A.  Brogi, Chiarelli, A., Mancarella, P., Mazzotta, V., Pedreschi, D., Renso, C., and Turini, F., ?Implementations of Program Composition Operations?, pp. 292?307, 1994.

A.  Chiarelli, Mazzotta, V., and Renso, C., ?A WAM Estesa per la Composizione di Programi Logici?, in GULP, 1993, pp. 189-202.