Umar, A Riduan, and Pio Ranap Tua Naibaho. “Analisa Perbandingan Pelaksanaan Erection Girder Underpass Pada Jalan Nasional Dengan Metode Crane Dan Metode Launcher”. Asian Journal of Mechatronics and Electrical Engineering 1, no. 1 (September 30, 2022): 1–12. Accessed May 1, 2026. https://journal.formosapublisher.org/index.php/ajmee/article/view/1122.