TY - SLIDE TI - Matching Levels of Task Difficulty for Different Modes of Presentation in a VR Table Tennis Simulation by Using Assistance Functions and Regression Analysis T2 - HCI International 2014 A2 - Pietschmann, Daniel CY - Heraklion, GR DA - 2014/06/22/27 PY - 2014 M3 - Paper Presentation ER -