https://link.springer.com/content/pdf/10.3758%2FPP.70.1.158.pdf (Publisher version)
Kelly, J., Riecke, B., Loomis, J., & Beall, A. (2008). Visual control of posture in real and virtual environments. Perception and Psychophysics, 70(1), 158-165. doi:10.3758/PP.70.1.158.