[Schulze et al., 2005]
Jürgen Schulze, Andrew Forsberg, Kleppe, Robert Zeleznik, and David H. Laidlaw. Characterizing the Effect of Level of Immersion on a 3D Marking Task. In Proceedings of HCI International, Las Vegas, NE, July 2005. (pdf) (bibtex: Schulze-2005-CTE).