Pumpoung, T., K. Nuangwongsa, P. Wongsiritorn, and P. Phomngulaum. “The Circularly Polarized Corner-Truncated Rectangular Patch Antenna With Double Slits for UHF RFID System”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 10, no. 3, Aug. 2018, pp. 103-8, https://jtec.utem.edu.my/jtec/article/view/3297.