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DOI: http://dx.doi.org/10.1016/S0167-6423(98)00023-9

Ehrig, Hartmut, Gregor Engels, Hans Jörg Kreowski, and Grzegorz Rozenberg. Handbook of Graph Grammars and Computing by Graph Transformation: Vol. 2: Applications, Languages, and Tools. River Edge, NJ, USA: World Scientific Publishing Co., Inc., 1999.
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Heckel, Reiko, Gregor Engels, Hartmut Ehrig, and Gabriele Taentzer. “A View-Based Approach to System Modeling Based on Open Graph Transformation Systems.” In Handbook of Graph Grammars and Computing by Graph Transformations, Volume 2: Applications, Languages and Tools, 639–68. Singapore: World Scientific, 1999.
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Heckel, Reiko, Gregor Engels, Hartmut Ehrig, and Gabriele Taentzer. “Classification and Comparison of Module Concepts for Graph Transformation Systems.” In Handbook of Graph Grammars and Computing by Graph Transformations, Volume 2: Applications, Languages and Tools, 2:669–89. Singapore: World Scientific, 1999.
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Eggert, A, ed. Kundenbindung Aus Kundensicht: Konzeptualisierung, Operationalisierung, Verhaltenswirksamkeit. Wiesbaden: Gabler, 1999.
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Eshlaghi, Soheyla, Cedrik Meier, Dieter Suter, D. Reuter, and A. D. Wieck. “Depth Profile of the Implantation-Enhanced Intermixing of Ga+ Focused Ion Beam in AlAs/GaAs Quantum Wells.”https://doi.org/10.1063/1.371720__Journal of Applied Physics 86, no. 11 (1999): 6605–7.https://doi.org/10.1063/1.371720 .
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Kremer, H.-Hugo. “Realisierung fächer- und lernortübergreifender Ausbildungskonzepte.” In Lehren und Lernen in der Aus- und Weiterbildung, edited by P.F.E. Sloane, R. Bader, and G. Straka. Opladen, 1999.
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Kremer, H.-Hugo, and Peter F. E. Sloane. “Lernfelder - Motor didaktischer Innovationen.” Kölner Zeitschrift für Wirtschaft und Pädagogik, no. 26 (1999): 37–60.
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Kremer, H.-Hugo. “Can students act? Explorative Studie zum Erfolg fächer- und lernortübergreifender Maßnahmen.” Kölner Zeitschrift für Wirtschaft und Pädagogik, no. 27 (1999): 93–110.
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Kremer, H.-Hugo, and K. Wilbers. “Das virtuelle Seminar ‘Wirtschaftspädagogik Köln-München.’” In Virtus, virtuelle Universitätssysteme Köln: Jahresbericht 1998/1999, edited by Bertelsmann Stiftung, 93–99. Gütersloh, 1999.
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