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Löhr-Richter, Perdita, and Gregor Engels. Incremental Design of Conceptual Database Schemata with CADDY. Leiden University, P.O. Box 9500, 2300 RA Leiden, The Netherlands: Leiden University, 1991.
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Stelter, Peter, and Walter Sextro. “Bifurcations in Dynamic Systems with Dry Friction.”https://doi.org/10.1007/978-3-0348-7004-7_44__In Bifurcation and Chaos: Analysis, Algorithms, Applications, edited by R. Seydel, F.W. Schneider, T. Küpper, and H. Troger, 97:343–47. International Series of Numerical Mathematics / Internationale Schriftenreihe Zur Numerischen Mathematik / S\rquote erie Internationale d’Analyse Num\rquote erique. Birkhäuser Basel, 1991.https://doi.org/10.1007/978-3-0348-7004-7_44 .
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Domik, Gitta, and KD  Mickus. “Visualization in the Analysis Cycle of Observational Data, in Analyzing and Modeling Data and Knowledge.” In Proceedings of the 15th Annual Conference of the “Gesellschaft Für Klassifikation e.V.” University of Salzburg, edited by M. Schader, 267–76, 1991.
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Peckhaus, Volker. “Logic in Transition: The Logical Calculi of Hilbert (1905) and Zermelo (1908) [Abstract].” In Abstracts of the 9th International Congress of Logic, Methodology and Philosophy of Science, Uppsala, August 7–14, 1991, Bd. 2: General Philosophy of Science. Sections 6–9, 158. o.O.u.J. (Uppsala), 1991.
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Müller, Wolfgang. “Contract-Oriented System Design and Specification.” In Proceedings of the Workshop on Practical Computer Based Systems Engineering - Its Scope and Methods. Grassau Germany, 1991.
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Lehrenfeld, Georg, and Wolfgang Müller. “Validation of EXPRESS Models Using Prolog.” In Proceedings of the 1st EXPRESS User’s Group Conference. Houston TX, USA, 1991.
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Hohenstein, Uwe, and Gregor Engels. “Formal Semantics of an Entity-Relationship Query Language.” In Proceedings of the 9th International Conference on Entity-Relationship Approach (ER 90), Lausanne, Switzerland, 177–88. ER Institute, 1990.
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Dietzfelbinger, Martin, and Friedhelm Meyer auf der Heide. “A New Universal Class of Hash Functions and Dynamic Hashing in Real Time.”https://doi.org/10.1007/bfb0032018__In Automata, Languages and Programming. Berlin/Heidelberg, 1990.https://doi.org/10.1007/bfb0032018 .
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