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2. Presenting Route Instructions on Mobile Devices;Kray,2003
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4. The Web3D consortium, The Virtual Reality Modeling Language, ISO/IEC Std 14772-1:1997 and ISO/IEC 14772-2:2004, http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/.
5. [2431CC] Development Kit User Manual, http://focus.ti.com/docs/toolsw/folders/print/cc2431dk.html.