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

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