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.

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.

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.

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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

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.

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.

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.

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.

Mickus, KD, EW Brugel, Gitta Domik, and TR Ayres. “A Case Study: Multi-Sensor Data Analysis of Hh Objects via Star: A Scientific Toolkit for Astrophysical Research.” In Bulletin of the American Astronomical Society, 22:1259, 1990.

Mickus, KD, Gitta Domik, EW Brugel, and TR Ayres. “Star-a Scientific Toolkit for Astrophysical Research.” In Bulletin of the American Astronomical Society, 22:828, 1990.

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 .

Eke, Norbert Otto, András Vizkelety, Karl Jürgen Skrodzki, and Hartmut Steinecke. Nikolaus Lenau. Werke und Briefe. Historisch-kritische Gesamtausgabe. Bd. 5,1: Briefe 1812-1837. Teil 1: Text (Edition). Wien: Österreichischer Bundesverlag, Klett-Cotta, 1989.

Zimmer, Detmar. Flankenspielorientierte Einstellung Der Hypoid- Und Kegelradgetriebe. Universität Stuttgart, 1989.