Himawanto W, Sanjaya A, Wijanarko B. Design and build a timekeeping device on RFID-based fast roller skating sports. SPORTIF [Internet]. 2023 May 25 [cited 2024 Dec. 23];8(3):186-20. Available from: https://ojs.unpkediri.ac.id/index.php/pjk/article/view/20061