1. Updates, a new frontier;Abiteboul,1988
2. K. Apt, “Introduction to Logic Programming”, Technical Report TR-87-35, Univ. of Texas, Austin. Also in “Handbook of Theoretical Computer Science,” North Holland, Amsterdam, to appear.
3. On the Power of Languages for the Manipulation of Complex Objects;Abiteboul;INRIA Technical Report,1988
4. Toward a theory of declarative knowledge;Apt,1988
5. S. ABITEBOUL AND E. SIMON, Fundamental properties of deterministic and non-deteministic extensions of datalog, Theoret. Comput. Sci., to appear.