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http://hi.baidu.com/wangdong8611/item/9458849e1708b7dc1e4271fd3
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3. Guo, B., Fujimura, R., Zhang, D., Imai, M.: Design-in-play: improving the variability of indoor pervasive games. Multimedia Tools and Applications (2011). doi:
10.1007/s11042-010-0711-z
4. Deuker, A.: Del 11.2: Mobility and LBS. FIDIS Deliverables, 11 (2) (2008)
5. Location-based service.
http://en.wikipedia.org/wiki/Location-based_service