Adeel Nasir Khan, Shabbir Majeed Chaudhry, Rashid Saleem, Muhammad Farhan Shafique, and Sabih ur Rehman, “A High Density 16-bit Polarization-Independent Chipless Passive RFID Tag”, ACES Journal, vol. 34, no. 08, pp. 1242–1245, Aug. 2019.