Specification and Formal Verification of Temporal Properties of Production Automation Systems
S. Flake, W. Müller, U. Pape, J. Ruf, in: H. Ehrig, W. Damm, J. Desel, M. Große-Rhode, W. Reif, E. Schnieder, E. Westkämper (Eds.), Integration of Software Specification Techniques for Applications in Engineering, Springer-Verlag, Berlin, Heidelberg, 2004, pp. 206–226.

Formal Semantics of Static and Temporal State-Oriented OCL Constraints
S. Flake, W. Müller, Journal on Software and System Modeling (SoSyM) 2 (2003) 164–186.

Expressing Property Specification Patterns with OCL
S. Flake, W. Müller, in: Proceedings of SERP’03, Las Vegas, NV, 2003.

An OCL Extension for Real-Time Constraints
S. Flake, W. Müller, in: T. Clark, J. Warmer (Eds.), Advances in Object Modelling with the OCL, Springer-Verlag, Berlin, Heidelberg, 2002, pp. 150–171.