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Mickus, K., Domik, G., Brugel, E., &; Ayres, T. (1990). Star-a scientific toolkit for astrophysical research. In Bulletin of the American Astronomical Society (Vol. 22, p. 828).
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Hellebrand, S., Wunderlich, H.-J., &; F. Haberl, O. (1990). Generating Pseudo-Exhaustive Vectors for External Testing. IEEE Design for Testability Workshop, Vail, CO, USA.
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Margaritis, B. (1990). Analyse eines Sperr-Flußkonverters.
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Hellebrand, S., &; Wunderlich, H.-J. (1990). Tools and Devices Supporting the Pseudo-Exhaustive Test. European Design Automation Conference (EDAC’90), 13–17.https://doi.org/10.1109/edac.1990.136612 
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Hellebrand, S., Wunderlich, H.-J., &; F. Haberl, O. (1990). Generating Pseudo-Exhaustive Vectors for External Testing. IEEE International Test Conference (ITC’90), 670–679.https://doi.org/10.1109/test.1990.114082 
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EBBERG, A., &; Noé, R. (1990). NOVEL HIGH-PRECISION ALIGNMENT TECHNIQUE FOR POLARIZATION MAINTAINING FIBERS USING A FREQUENCY MODULATED TUNABLE LASER. ELECTRONICS LETTERS, 26(24), 2009–2011.https://doi.org/10.1049/el:19901299 
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Noé, R., ZAH, C., MAEDA, M., CANEAU, C., MENOCAL, S., WAGNER, R., &; LEE, T. (1990). OPTICAL AMPLIFIER WITH 27-DB DYNAMIC-RANGE IN A COHERENT TRANSMISSION-SYSTEM. IEEE PHOTONICS TECHNOLOGY LETTERS, 2(2), 120–121.https://doi.org/10.1109/68.47067 
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Noé, R., ZAH, C., MAEDA, M., CANEAU, C., MENOCAL, S., WAGNER, R., &; LEE, T. (1990). OPTICAL AMPLIFIER WITH 27-DB DYNAMIC-RANGE IN A COHERENT TRANSMISSION-SYSTEM. IEEE PHOTONICS TECHNOLOGY LETTERS, 2(2), 120–121.https://doi.org/10.1109/68.47067 
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Noé, R., RODLER, H., GAUKEL, G., EBBERG, A., &; AURACHER, F. (1990). POLARIZATION-INDEPENDENT AND PATTERN-INDEPENDENT OPTICAL FSK HETERODYNE SYSTEM USING DATA-INDUCED POLARIZATION SWITCHING. ELECTRONICS LETTERS, 26(3), 176–177.https://doi.org/10.1049/el:19900119 
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Noé, R., RODLER, H., GAUKEL, G., NOLL, B., &; EBBERG, A. (1990). HIGH-PERFORMANCE, 2-CHANNEL OPTICAL FSK HETERODYNE SYSTEM WITH POLARIZATION DIVERSITY RECEIVER. ELECTRONICS LETTERS, 26(15), 1109–1110.https://doi.org/10.1049/el:19900717 
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Hilgert, J. (1990). Applications of Lie Semigroups in Analysis. In K. H. Hofmann &; et al. (Eds.), The Analytical and Topological Theory of Semigroups. De Gruyter.
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Hilgert, J., &; Hofmann, K. H. (1990). On the Causal Structure of Homogeneous Manifolds. Math. Scand., 67, 119–144.
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Kleine Büning, H., Lettmann, T., &; Mayr, E. W. (1989). Projections of vector addition system reachability sets are semilinear. Theoretical Computer Science, 343–350.https://doi.org/10.1016/0304-3975(89)90055-8 
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Ebert, J., &; Engels, G. (1989). Konzepte einer Software-Architektur-Beschreibungssprache. In Software-Entwicklung: Konzepte, Erfahrungen, Perspektiven, Fachtagung, 1989, Marburg (Germany) (Vol. 212, pp. 238–250). Berlin/Heidelberg: Springer.
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Engels, G. (1989). CADDY-O: Syntaxgestütztes, graphisches Entwerfen konzeptioneller Datenbankschemata. In Tagungsband GI-Fachtagung “Interaktive Schnittstellen für Informationssysteme”, TU Clausthal, Notizen zu Interaktive Systeme (Vol. 18, pp. 1–16).
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Engels, G., Hohenstein, U., Hülsmann, K., Löhr-Richter, P., &; Ehrich, H.-D. (1989). CADDY: Computer-Aided Design of Non-Standard Databases. In Proceedings of the International Conference on System Development Environments &; Factories, Berlin, Germany. Berlin: Pitman Publishing.
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Engels, G. (1989). Benutzerschnittstelle und Architektur der integrierten Datenbankentwurfsumgebung CADDY (Kurzfassung). TU Braunschweig.
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Engels, G., &; Schäfer, W. (1989). Programmentwicklungsumgebungen: Konzepte und Realisierung. Stuttgart: Teubner.
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Dellnitz, M., &; Werner, B. (1989). Computational methods for bifurcation problems with symmetries—with special attention to steady state and Hopf bifurcation points. Journal of Computational and Applied Mathematics, 97–123.https://doi.org/10.1016/0377-0427(89)90150-7 
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