,
Springer
Lecture Notes in Computer Science
International Symposium on Design and Implementation of Symbolic Computation Systems
Networks and Optimization

Bol, R. N., Apt, K., & Klop, J. W. (1990). On the power of subsumption and context checks. In Proceedings of the International Symposium on Design and Implementation of Symbolic Computation Systems 1990 (pp. 131–140). Springer.