Müller, Dieter, F. Wilhelm Bruns, Heinz-Hermann Erbe, Bernd Robben, and Yong-Ho Yoo. 2007. “Mixed Reality Learning Spaces for Collaborative Experimentation: A Challenge for Engineering Education and Training”. International Journal of Online and Biomedical Engineering (iJOE) 3 (4). https://doi.org/10.3991/ijoe.v3i4.454.