MUM 2003. Proceedings of the 2nd International Conference on Mobile and Ubiquitous Multimedia
Ishii, H., Ullmer, B. Tangible Bits: Towards Seamless Interfaces between People; Bits and Atoms. In proceedings of CHI 97; Atlanta; Georgia; USA; ACM Press; 1997; pp. 234-241.
Turk; M.; Robertson; G. Perceptual User Interfaces Communications of the ACM; March 2000.