M. Andries et al., “Graph Transformation for Specification and Programming,” Science of Computer Programming, vol. 34, no. 1, pp. 1–54, 1999.
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DOI: http://dx.doi.org/10.1016/S0167-6423(98)00023-9

H. Ehrig, G. Engels, H. J. Kreowski, and G. 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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R. Heckel, G. Engels, H. Ehrig, and G. 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, Singapore: World Scientific, 1999, pp. 639–668.
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R. Heckel, G. Engels, H. Ehrig, and G. 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, vol. 2, Singapore: World Scientific, 1999, pp. 669–689.
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A. Eggert, Ed., Kundenbindung aus Kundensicht: Konzeptualisierung, Operationalisierung, Verhaltenswirksamkeit. Wiesbaden: Gabler, 1999.
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S. Eshlaghi, C. Meier, D. Suter, D. Reuter, and A. D. Wieck, “Depth profile of the implantation-enhanced intermixing of Ga+ focused ion beam in AlAs/GaAs quantum wells,” Journal of Applied Physics, vol. 86, no. 11, pp. 6605–6607, 1999.
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DOI: 10.1063/1.371720

H.-H. Kremer, “Realisierung fächer- und lernortübergreifender Ausbildungskonzepte,” in Lehren und Lernen in der Aus- und Weiterbildung, P. F. E. Sloane, R. Bader, and G. Straka, Eds. Opladen, 1999.
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H.-H. Kremer and P. F. E. Sloane, “Lernfelder - Motor didaktischer Innovationen,” Kölner Zeitschrift für Wirtschaft und Pädagogik, no. 26, pp. 37–60, 1999.
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H.-H. Kremer, “Can students act? Explorative Studie zum Erfolg fächer- und lernortübergreifender Maßnahmen,” Kölner Zeitschrift für Wirtschaft und Pädagogik, no. 27, pp. 93–110, 1999.
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H.-H. Kremer and K. Wilbers, “Das virtuelle Seminar ‘Wirtschaftspädagogik Köln-München,’” in Virtus, virtuelle Universitätssysteme Köln: Jahresbericht 1998/1999, Bertelsmann Stiftung, Ed. Gütersloh, 1999, pp. 93–99.
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