1. Andersen, P., Bak, L., Brandt, S., Knudsen, J. L., Madsen, O. L., Moller, K. J., NOrgaard, C., and Sandvad, E. (93). The Mjolner BETA System. In Object-Oriented Environments - The MjolnerApproach,pages 24–35. Prentice-Hall.
2. Baker, M. J. and Eick, S. G. (1995). Space-filling Software Visualisation. Journal of Visual Languages and Computing, 6: 119–133.
3. Ball, T. and Eick, S. G. (1996). Software Visualization in the Large. IEEE Computer,29(4):33– 43.
4. Bederson, B. B. and Hollan, J. D. (1994). Pad++: A Zooming Graphical Interface for Exploring Alternate Interface Physics. In Proceedings of ACM UIST ‘84 ACM Press.
5. Bederson, B. B., Hollan, J. D., Perlin, K., Meyer, J., Bacon, D., and Fumas, G. (1996). Pad++: A Zoomable Graphical Sketchpad for Exploring Alternate Interface Physics. Journal of Visual Languages and Computing, 7: 3–31.