Arianto, I. S., Nuri, N. and Yulianto, A. (2017) “Effect of the Pull and Diameter String of Badminton Racket Based on Coeffisient of Restitution Value”, Journal of Natural Sciences and Mathematics Research, 2(1), pp. 85–90. Available at: https://journal.walisongo.ac.id/index.php/JNSMR/article/view/1639 (Accessed: 7 June 2025).