Liu, Alex X.; Shahzad, Muhammad; Xiulong Liu, ; Keqiu Li, : 'RFID estimation—impact of blocker tags' (Control, Robotics and Sensors, 2017), 'RFID Protocol Design, Optimization, and Security for the Internet of Things', Chap. 4, pp. 93-122, DOI: 10.1049/PBCE112E_ch4 IET Digital Library, https://digital-library.theiet.org/;jsessionid=rxt5b9dl3atw.x-iet-live-01content/books/10.1049/pbce112e_ch4