Gunasagaran, Rajeshkumar, et al. “Wi-Fi For Indoor Device Free Passive Localization (DfPL): An Overview”. Indonesian Journal of Electrical Engineering and Informatics (IJEEI), vol. 8, no. 1, Mar. 2020, pp. 103-11, https://doi.org/10.52549/ijeei.v8i1.1062.