Wehrheim H. Specifying Reactive Systems with Action Dependencies: Modelling and Hierarchical Design. University of Hildesheim, Germany; 1996.

Goltz U, Wehrheim H. Modelling Causality via Action Dependencies in Branching Time Semantics. Inf Process Lett. 1996;(4):179--184. doi:10.1016/0020-0190(96)00111-1

Goltz U, Wehrheim H. Causal Testing. In: Penczek W, Szalas A, eds. Mathematical Foundations of Computer Science 1996, 21st International Symposium, MFCS’96, Cracow, Poland, September 2-6, 1996, Proceedings. Lecture Notes in Computer Science. ; 1996:394--406. doi:10.1007/3-540-61550-4_165

Rensink A, Wehrheim H. Weak Sequential Composition in Process Algebras. In: Jonsson B, Parrow J, eds. CONCUR ’94, Concurrency Theory, 5th International Conference, Uppsala, Sweden, August 22-25, 1994, Proceedings. Lecture Notes in Computer Science. ; 1994:226--241. doi:10.1007/978-3-540-48654-1_20

Wehrheim H. Parametric Action Refinement. In: Olderog E-R\'22udiger, ed. Programming Concepts, Methods and Calculi, Proceedings of the IFIP T/W.1/W.2/W.3 Working Conference on Programming Concepts, Methods and Calculi (PROCOMET ’94) San Miniato, Italy, 6-10 June, 1994. IFIP Transactions. ; 1994:247--266.