- Hartmut Ehrig, Christiane Floyd, Maurice Nivat, James W. Thatcher, editors, Mathematical Foundations of Software Development, Proceedings of the International Joint Conference on Theory and Practice of Software Development (TAPSOFT), Berlin, Germany, March 25-29, 1985, Volume 1: Colloquium on Trees in Algebra and Programming (CAA. Volume 185 of Lecture Notes in Computer Science, Springer, 1985.
- Hartmut Ehrig, Christiane Floyd, Maurice Nivat, James W. Thatcher, editors, Mathematical Foundations of Software Development, Proceedings of the International Joint Conference on Theory and Practice of Software Development (TAPSOFT), Berlin, Germany, March 25-29, 1985, Volume 2: Colloquium on Software Engineering (CSE). Volume 186 of Lecture Notes in Computer Science, Springer, 1985.