Hüllermeier, Eyke. “Fuzzy Polynomial and Spline Interpolation.” In In Proceedings IMACS Symposium on Systems Analysis and Simulation, Berlin, 401–4. Gordon and Breach Publishers, 1995.
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Hüllermeier, Eyke. “Konjunkturzyklen Aufgrund von Investitionsinterdependenzen:  Simulation Und Empirische Überprüfung.” In Moderne Makroökonomie-Eine Kritische Bestandsaufnahme, edited by J. Flemmig, 413–54. Metropolis, 1995.
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Hüllermeier, Eyke. “Approximate Solution of a Linear Programming Problem Using a Modified Perceptron-Algorithm.” In In Proceedings EUFIT-94 2nd European Congress on Intelligent Techniques and Soft Computing, Aachen, Germany, edited by H.J. Zimmermann, 195–99, 1994.
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Flögel, A., H. Kleine Büning, and Theodor Lettmann. “On the Restricted Equivalence for Subclasses of Propositional Logic.”https://doi.org/10.1051/ita/1993270403271__RAIRO - Theoretical Informatics and Applications, 1993, 327–40.https://doi.org/10.1051/ita/1993270403271 .
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DOI: 10.1051/ita/1993270403271

Dahn, Bernd I., Theodor Lettmann, and Wolfgang Schönfeld. ILFA Interface Concept. Vol. 193. IWBS Report. ´Heidelberg: Wissenschaftliche Zentrum der IBM Deutschland , 1991.
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Kleine Büning, Hans, Theodor Lettmann, and Ernst W. Mayr. “Projections of Vector Addition System Reachability Sets Are Semilinear.”https://doi.org/10.1016/0304-3975(89)90055-8__Theoretical Computer Science, 1989, 343–50.https://doi.org/10.1016/0304-3975(89)90055-8 .
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DOI: 10.1016/0304-3975(89)90055-8

Kleine Büning, Hans, and Theodor Lettmann. “Perspektiven Für Die Logikprogrammierung.” In Workshop Wissensrepräsentation in Expertensystemen, edited by G. Rahmstorf, 56–78. Berlin, Heidelberg, 1988.
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Büning, Hans Kleine, and Theodor Lettmann. “Representation Independent Query and Update Operations on Propositional Definite Horn Formulas.”https://doi.org/10.1007/3-540-18170-9_167__In Computation Theory and Logic, edited by Egon Börger, 208–23. Berlin, Heidelberg, 1987.https://doi.org/10.1007/3-540-18170-9_167 .
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DOI: 10.1007/3-540-18170-9_167

Kleine Büning, H., and Theodor Lettmann. “Classes of First Order Formulas under Various Satisfiability Definitions.”https://doi.org/10.1007/3-540-16780-3_119__In 8th International Conference on Automated Deduction. Berlin, Heidelberg, 1986.https://doi.org/10.1007/3-540-16780-3_119 .
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DOI: 10.1007/3-540-16780-3_119