Fernando Ney Nascimento,  Vagner Sacramento,  Gustavo Baptista,  Hana Rubinsztejn,  Markus Endler. 

In this paper, we present the features and the architecture of a location service, called Location Inference Service (LIS), which infers the approximate location of mobile devices, measuring the radio-frequency signal strength obtained from Access Points of IEEE 802.11 wireless networks.

http://www.lbd.dcc.ufmg.br:8080/colecoes/sbrc/2006/sc2_1.pdf

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