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Borys, Bernd-Burkhard and Sundström, G. A. and Fejes, Lajos and Strätz, Gerd. The intelligent graphical editor with design support and user model (IGE3): ESPRIT-GRADIENT Report P857-WP11-UKS 059. IMAT-Bericht / MMS, (10) Institut für Meß- u. Automatisierungstechnik, Kassel, Year 1990.

Johannsen, Gunnar and Borys, Bernd-Burkhard and Sundström, G. A. and Fejes, Lajos and Strätz, Gerd. Issues of Design Support and User Modelling for Intelligent Graphical Editors, and Presentation System: ESPRIT-Gradient-P857 Report WP4+11-UKS-055. IMAT-Bericht / MMS, (MMS-8) Kassel, Year 1989.

Johannsen, Gunnar and Borys, Bernd-Burkhard and Sundström, G. A. and Fejes, Lajos and Strätz, Gerd. Issues of Design Support and User Modelling for Intelligent Graphical Editors, and Presentation System: ESPRIT-Gradient-P857 Report WP4+11-UKS-055. IMAT-Bericht / MMS, (MMS-8) Kassel, Year 1989.