Edward W. Ishak, Steven Feiner. Interacting with hidden content using content-aware free-space transparency. In Steven Feiner, James A. Landay, editors, Proceedings of the 17th Annual ACM Symposium on User Interface Software and Technology, Santa Fe, NM, USA, October 24-27, 2004. pages 189-192, ACM, 2004. [doi]
Abstract is missing.