1. Traversable Interfaces Between Real and Virtual Worlds;Koleva,2000
2. The metaDESK: Models and Prototypes for Tangible User Interfaces;Ullmer,1997
3. Research Directions in Virtual Environments;Bishop;Computer Graphics,1992
4. To Build Object-Oriented Virtual Factory Based on V.R. and Simulation Tools;Viganè,2002
5. A Framework and Testbed for Studying Manipulation Techniques for Immersive VR;Poupyrev,1997