1. K.R. Apt. Introduction to logic programming (revised and extended version. Technical Report CS-R8826, Centre for Mathematics and Computer Science, Amsterdam, 1988. To appear as a chapter in Handbook of Theoretical Computer Science, North-Holland (J. van Leeuwen, editor).
2. S.D. Brookes, C.A.R. Hoare, and W. Roscoe. A theory of communicating sequential processes. JACM, 31:499–560, 1984.
3. J.W. de Bakker and J.N. Kok. Uniform abstraction, atomicity and contractions in the comparative semantics of concurrent prolog. In Proc. Fifth Generation Computer Systems, pages 347–355, Tokyo, Japan, 1988. Extended Abstract, full version available as CWI report CS-8834. To appear on Theoretical Computer Science.
4. F.S. de Boer, J.N. Kok, C. Palamidessi, and J.J.M.M. Rutten. Control flow versus logic: a denotational and a declarative model for guarded horn clauses. In Proc. of the Symposium on Mathematical Foundations of Computer Science, LNCS, pages 165–176, 1989.
5. F.S. de Boer, J.N. Kok, C. Palamidessi, and J.J.M.M. Rutten. Semantic models for a version of parlog. In G. Levi and M. Martelli, editors, Proc. of the Sixt International Conference on Logic Programming, pages 621–636, Lisboa, 1989. MIT Press. Extended version to appear in Theoretical Computer Science.