Mardhiyah, Ainil, et al. “Analisis Frekuensi Alami Dengan Undamped-Degree of Freedom System Pada Jembatan Sei Wampu”. Jurnal Aplikasi Teknik Sipil, vol. 21, no. 4, July 2025, pp. 329-36, https://journal.its.ac.id/index.php/jats/article/view/7368.