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Hilgert, Joachim. “Group Theoretical Aspects of Gödels Model.” In Jahrbuch Der Gödel Gesellschaft, edited by Joachim Hilgert. Wien, 1991.
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Hilgert, Joachim. “Infinitesimally Generated Subsemigroups of Motion Groups.” Rocky Mount. J. Math. 21 (1991): 865–78.
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Hilgert, Joachim, and K.-H. Neeb, eds. Lie-Gruppen und Lie-Algebren. Wiesbaden: 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, 1991.
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Rösler, Margit. “On Optimal Linear Mean Estimators for Weakly Stationary Stochastic Processes.” In Orthogonal Polynomials and Their Applications (Erice, 1990), 373–378. IMACS Ann. Comput. Appl. Math., 9, 1991.
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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 .
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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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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 .
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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 .
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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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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 .
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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 .
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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 .
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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 .
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Meyer auf der Heide, Friedhelm. “Das Heinz Nixdorf-Institut Der Universität-GH Paderborn.” Informatik Spektrum 13, no. 4 (1990): 231–32.
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Domik, Gitta, E.W. Brugel, and R.E. Stencel. “IRAS On-Line Catalogs at CASA.” In Proceedings of the 176th Meeting of the American Astronomical Society, Vol. Vol. 22. BAAS, 1990.
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Haeb-Umbach, Reinhold, D. Rugar, T. Howell, and G. P. Coleman. “Coding and Signal Processing for a Magneto-Optic Resonant Bias Coil Overwrite Experiment.” In International Conference on Communication, Atlanta, 1990.
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Domik, Gitta, EW Brugel, RE Stencel, S Vasudevan, and J Pang. “Applications of IRAS Preprocessing at the Workstation.” In Bulletin of the American Astronomical Society, 22:828, 1990.
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Domik, Gitta, Edward W Brugel, Robert E Stencel, Jinzhong Pang, and Subramanian Vasudevan. “Workstation-Based Preprocessing of IRAS Sky-Flux Images.” Publications of the Astronomical Society of the Pacific 102, no. 656 (1990): 1167.
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