Nordin, Nor Farah Amira, et al. “Influence of Air Gaps in Fastening System at KTMB Electrified Double Track in Kluang”. Progress in Engineering Application and Technology, vol. 5, no. 2, Nov. 2024, pp. 719-25, https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/16128.