Muhammad Irfan Aziz and  Thomas Owens and  Uzair Khaleeq uz Zaman,  Received Signal Strength Indicator Based Localization of Bluetooth Devices Using Trilateration: An Improved Method for the Visually Impaired People.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2019, vol. 146(2). 88 - 93
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