1. T. Flaig, J.G. Neugebauer, R. Daeinghaus, Virtual Reality for robot simulation and off-line programming. CIM-Managment, Band 10, Heft 6, Seiten 11–16, 1994 (in German).
2. W. Krueger, B. Fröhlich, The Responsative Workbench (Virtual Work Environment), IEEE Computer Graphics and Applications, Band 14, Heft 3, Seiten 12–15, 1994.
3. L. Mac Douals, J. Vince, Interacting with Virtual Environments, England, 1994.
4. J. Vince, Virtual Reality Systems, ACM Press, 1995.