Christopher J. Dede Marilyn C. Salzman R. Bowen Loftin ScienceSpace: virtual realities for learning complex and abstract scientific concepts. 246-252 1996 VRAIS https://doi.org/10.1109/VRAIS.1996.490534 https://doi.ieeecomputersociety.org/10.1109/VRAIS.1996.490534 conf/vr/1996 db/conf/vr/vrais1996.html#DedeSL96