1. ISO/IEC: International Organization for Standardization: QR Code. ISO/IEC 18004 (2000)
2. ISO/IEC: International Organization for Standardization: DataMatrix. ISO/IEC 16022 (2000)
3. Han, T.D., et al.: Machine readable code and method and device of encoding and decoding the same, japan patent 3336311 (2002)
4. Han, T.D., et al.: Implementation of personalized situation-aware service. In: ubiPCMM 2005. Proceedings of the First Internaltional Workshop on Personalized Context Modeling and Management for UbiComp Applications (2005)
5. Lecture Notes in Computer Science;M. Rohs,2005