Javadi, Kourosh, and Nader Komjani. “Investigation into Low SAR PIFA Antenna and Design a Very Low SAR U-Slot Antenna Using Frequency Selective Surface for Cell-Phones and Wearable Applications”. Emerging Science Journal, vol. 1, no. 3, Nov. 2017, pp. 145-57, doi:10.28991/ijse-01117.