/-Visualization interactions\user performance in different VR environments

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http://vis.cs.brown.edu/  
Michael Kirby, Daniel Keefe, and David H. Laidlaw. Painting and Visualization http://vis.cs.brown.edu/results/images/Kirby-2004-PAV.018.html

user performance in different VR environmentshttp://vis.cs.brown.edu/areas/projects/vrperformance.html

two-handed interactions, http://vis.cs.brown.edu/docs/pdf/Cutler-1997-THD.pdf