Encarnação, José L. ; Mengel, Maximilian ; Bono, Peter R. ; Böhm, Klaus ; Borgmeier, Elmar ; Brisson Lopes, J. M. ; Hornung, Christoph ; Knierriem-Jasnoch, Anette ; Koch, Eckhard ; Krömker, Detlef ; Lindner, Rolf ; Paris, Cesar ; Sandberg, A. ; Schnaider, Michael ; Storck, Dietmar ; Teixeira, José Carlos ; Urban, Bodo ; Wang, T. (1998):
A Concept and System Architecture for IT-Based Lifelong Learning.
In: Computers & Graphics, 22 (2-3), pp. 319-393. [Article]

Bono, Peter R. ; Encarnação, José L. ; Encarnação, L. Miguel ; Herzner, Wolfgang R. (1990):
PC Graphics with GKS : Introduction to Graphics Standards (GKS, GKS-3D, PHIGS, CGI and CGM) and to Graphics Programming.
Prentice Hall, Hertfordshire, ISBN 0-13-654435-5,
[Book]