- Samson Abramsky, T. S. E. Maibaum, editors, TAPSOFT 91: Proceedings of the International Joint Conference on Theory and Practice of Software Development, Brighton, UK, April 8-12, 1991, Volume 2: Advances in Distributed Computing (ADC) and Colloquium on Combining Paradigms for Software Developmemnt. Volume 494 of Lecture Notes in Computer Science, Springer, 1991.
- Samson Abramsky, T. S. E. Maibaum, editors, TAPSOFT 91: Proceedings of the International Joint Conference on Theory and Practice of Software Development, Brighton, UK, April 8-12, 1991, Volume 1: Colloquium on Trees in Algebra and Programming (CAAP 91). Volume 493 of Lecture Notes in Computer Science, Springer, 1991.