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Hilgert, Joachim. “Group Theoretical Aspects of Gödels Model.” Jahrbuch Der Gödel Gesellschaft, edited by Joachim Hilgert, 1991.
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Hilgert, Joachim. “Infinitesimally Generated Subsemigroups of Motion Groups.” Rocky Mount. J. Math., vol. 21, 1991, pp. 865–78.
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Hilgert, Joachim, and K. H. Neeb, editors. Lie-Gruppen und Lie-Algebren. Vieweg Verlag, 1991.
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Hilgert, Joachim. “Onishchik, A.L., Und E.B. Vinberg. Lie Groups and Algebraic Groups (Springer, New York, 1990).” Zentralblatt, vol. 722, 1991.
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Rösler, Margit. “On Optimal Linear Mean Estimators for Weakly Stationary Stochastic Processes.” Orthogonal Polynomials and Their Applications (Erice, 1990), IMACS Ann. Comput. Appl. Math., 9, 1991, pp. 373–378.
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Alt, Helmut, et al. “Approximation of Convex Polygons.”10.1007/bfb0032068__Automata, Languages and Programming, Springer-Verlag, 1990, pp. 703–16, doi:10.1007/bfb0032068.
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Hohenstein, Uwe, and Gregor Engels. “Formal Semantics of an Entity-Relationship Query Language.” Proceedings of the 9th International Conference on Entity-Relationship Approach (ER 90), Lausanne, Switzerland, ER Institute, 1990, pp. 177–88.
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Krauter, Stefan, and Rolf Hanitsch. “The Influence of the Capsulation on the Efficiency of PV-Modules.”10.1016/B978-0-08-037539-7.50062-4__Proceedings of the 1st World Renewable Energy Congress, Reading (UK), 23.–28. September 1990, Band 1, S. 141–144., 1990, doi:10.1016/B978-0-08-037539-7.50062-4.
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Engels, Gregor. “Elementary Actions on an Extended Entity-Relationship Database.”http://dx.doi.org/10.1007/BFb0017372__Proceedings of the Workshop on Graph Grammars and Their Application to Computer Science (1990), Bremen (Germany), vol. 532, Springer, 1990, pp. 344–62, doi:http://dx.doi.org/10.1007/BFb0017372.
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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.”10.1007/bfb0032018__Automata, Languages and Programming, 1990, doi:10.1007/bfb0032018.
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Meyer auf der Heide, Friedhelm. “Dynamic Hashing Strategies.”10.1007/bfb0029597__Lecture Notes in Computer Science, 1990, doi:10.1007/bfb0029597.
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Karpinski, Marek, and Friedhelm Meyer auf der Heide. “On the Complexity of Genuinely Polynomial Computation.”10.1007/bfb0029630__Lecture Notes in Computer Science, 1990, doi:10.1007/bfb0029630.
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Dietzfelbinger, M., and Friedhelm Meyer auf der Heide. “How to Distribute a Dictionary in a Complete Network.”10.1145/100216.100229__Proceedings of the Twenty-Second Annual ACM Symposium on Theory of Computing  - STOC ’90, 1990, doi:10.1145/100216.100229.
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Gil, J., et al. “Not All Keys Can Be Hashed in Constant Time.”10.1145/100216.100247__Proceedings of the Twenty-Second Annual ACM Symposium on Theory of Computing  - STOC ’90, 1990, doi:10.1145/100216.100247.
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Meyer auf der Heide, Friedhelm. “Das Heinz Nixdorf-Institut Der Universität-GH Paderborn.” Informatik Spektrum, vol. 13, no. 4, 1990, pp. 231–32.
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Domik, Gitta, et al. “IRAS On-Line Catalogs at CASA.” Proceedings of the 176th Meeting of the American Astronomical Society, vol. Vol. 22, no. No. 2, 1990.
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Haeb-Umbach, Reinhold, et al. “Coding and Signal Processing for a Magneto-Optic Resonant Bias Coil Overwrite Experiment.” International Conference on Communication, Atlanta, 1990.
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Domik, Gitta, et al. “Applications of IRAS Preprocessing at the Workstation.” Bulletin of the American Astronomical Society, vol. 22, 1990, p. 828.
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Domik, Gitta, et al. “Workstation-Based Preprocessing of IRAS Sky-Flux Images.” Publications of the Astronomical Society of the Pacific, vol. 102, no. 656, IOP Publishing, 1990, p. 1167.
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