Putri, Rahmi Riya, and Wildian Wildian. 2021. “Rancang Bangun Detektor Sinyal Radio Frequency Smartphone Dengan Frekuensi Operator GSM1800”. Jurnal Fisika Unand 9 (4):538-44. https://doi.org/10.25077/jfu.9.4.538-544.2020.