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[2] Paolo Bellavista, Axel Küpper, and Sumi Helal, “Location-based services: back to the future”, Published by the IEEE CS, vol. 7, no. 2, Apr./Jun. 2008
[3] Aphrodite Tsalgatidou, Jari Veijalainen, Jouni Markkula, Artem Katasonov and Stathes Hadjiefthymiades, “Mobile e-commerce and location-based Services: technology and requirements”.
[4] David Mountain and Jonathan Raper, “Positioning techniques for location-based services (LBS): characteristics and limitations of proposed solutions”, Aslib Proceedings, vol. 53, no. 10, Nov./Dec. 2001.
[4] David Mountain and Jonathan Raper, “Positioning techniques for location-based services (LBS): characteristics and limitations of proposed solutions”, Aslib Proceedings, vol. 53, no. 10, Nov./Dec. 2001.