Volume 21, Number 1, January 1990
Volume 21, Number 2, Spring 1990
Volume 21, Number 3, Summer 1990
Volume 21, Number 4, Fall 1990
- Luigi Palopoli:
A new proof of undecidability of safety of logic queries.
69-72

- B. Ravikumar:
Some applications of a technique of Sakoda and Sipser.
73-77

- Martin Tompa:
Figures of merit: the sequel.
78-81

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