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.
LibreCat: /record/16912

Peckhaus, Volker. “Ernst Schröder und die ,pasigraphischen Systeme‘ von Peano und Peirce.” Modern Logic 1, no. 2/3 (1991): 174–205.
LibreCat: /record/17473

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.
LibreCat: /record/17822

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.
LibreCat: /record/39584

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.
LibreCat: /record/39583

Schroeter-Wittke, Harald. “Letzter Sonntag Nach Epiphanias; Predigttext: 2. Korinther 4,6-10.” In Gottesdienstpraxis. Serie A. II. Perikopenreihe Band 1, edited by Horst Nitschke, Vol. 132–139. Gütersloh: Gütersloher Verlagshaus, 1991.
LibreCat: /record/43478

Goser, K., Ulrich Hilleringmann, and U. Rückert. “Application and Implementation of Neural Networks in Microelectronics.” In Artificial Neural Networks, edited by Alberto Prieto, 243–259. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991.
LibreCat: /record/39922

Eke, Norbert Otto. “Maximilian von Löwenthal.” In Literatur Lexikon. Autoren und Werke deutscher Sprache. Bd. 7, edited by Walther Killy, 7:332. Gütersloh, München, 1990.
LibreCat: /record/19490

Alt, Helmut, Johannes Blömer, and Hubert Wagener. “Approximation of Convex Polygons.”https://doi.org/10.1007/bfb0032068__In Automata, Languages and Programming, 703–16. Berlin/Heidelberg: Springer-Verlag, 1990.https://doi.org/10.1007/bfb0032068 .
LibreCat: /record/3050
DOI: 10.1007/bfb0032068

Peckhaus, Volker. Hilbertprogramm und Kritische Philosophie. Das Göttinger Modell interdisziplinärer Zusammenarbeit zwischen Mathematik und Philosophie. Vol. 7. Studien zur Wissenschafts-, Sozial- und Bildungsgeschichte der Mathematik. Göttingen: Vandenhoeck &; Ruprecht, 1990.
LibreCat: /record/17445

Eke, Norbert Otto, Norbert Oellers, Karl Jürgen Skrodzki, and Hartmut Steinecke. Nikolaus Lenau. Werke und Briefe. Historisch-kritische Gesamtausgabe. Bd. 6,1: Briefe 1838-1847. Teil 1: Text (Edition). Wien: Österreichischer Bundesverlag, Klett-Cotta, 1990.
LibreCat: /record/19151

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.
LibreCat: /record/7824

Krauter, Stefan, and Rolf Hanitsch. “The Influence of the Capsulation on the Efficiency of PV-Modules.”https://doi.org/10.1016/B978-0-08-037539-7.50062-4__In Proceedings of the 1st World Renewable Energy Congress, Reading (UK), 23.–28. September 1990, Band 1, S. 141–144., 1990.https://doi.org/10.1016/B978-0-08-037539-7.50062-4 .
LibreCat: /record/8081
DOI: 10.1016/B978-0-08-037539-7.50062-4

Engels, Gregor. “Elementary Actions on an Extended Entity-Relationship Database.”http://dx.doi.org/10.1007/BFb0017372__In Proceedings of the Workshop on Graph Grammars and Their Application to Computer Science (1990), Bremen (Germany), 532:344–62. Berlin/Heidelberg: Springer, 1990.http://dx.doi.org/10.1007/BFb0017372 .
LibreCat: /record/8259
DOI: http://dx.doi.org/10.1007/BFb0017372

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 .
LibreCat: /record/16738
DOI: 10.1007/bfb0032018

Meyer auf der Heide, Friedhelm. “Dynamic Hashing Strategies.”https://doi.org/10.1007/bfb0029597__In Lecture Notes in Computer Science. Berlin/Heidelberg, 1990.https://doi.org/10.1007/bfb0029597 .
LibreCat: /record/16739
DOI: 10.1007/bfb0029597

Karpinski, Marek, and Friedhelm Meyer auf der Heide. “On the Complexity of Genuinely Polynomial Computation.”https://doi.org/10.1007/bfb0029630__In Lecture Notes in Computer Science. Berlin/Heidelberg, 1990.https://doi.org/10.1007/bfb0029630 .
LibreCat: /record/16740
DOI: 10.1007/bfb0029630

Dietzfelbinger, M., and Friedhelm Meyer auf der Heide. “How to Distribute a Dictionary in a Complete Network.”https://doi.org/10.1145/100216.100229__In Proceedings of the Twenty-Second Annual ACM Symposium on Theory of Computing  - STOC ’90, 1990.https://doi.org/10.1145/100216.100229 .
LibreCat: /record/16741
DOI: 10.1145/100216.100229

Gil, J., Friedhelm Meyer auf der Heide, and A. Wigderson. “Not All Keys Can Be Hashed in Constant Time.”https://doi.org/10.1145/100216.100247__In Proceedings of the Twenty-Second Annual ACM Symposium on Theory of Computing  - STOC ’90, 1990.https://doi.org/10.1145/100216.100247 .
LibreCat: /record/16742
DOI: 10.1145/100216.100247

Meyer auf der Heide, Friedhelm. “Das Heinz Nixdorf-Institut Der Universität-GH Paderborn.” Informatik Spektrum 13, no. 4 (1990): 231–32.
LibreCat: /record/16824