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Referências
• A-GPS - NaviGad. Disponível em: <Gethttp://www.navigadget.com/index.php/gps-knowledge/a-gps-assisted-gps>. Acessado em: 18 Set. 2009.
• KUPPER, Axel. Location-based Services Fundamentals and Operation. John Wiley & Sons, 2005. 386 páginas.
• SADEH, Norman. M-Commerce Technologies, Services, and Business Models. John Wiley & Sons, 2002. 269 páginas.
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