Irawan, Sonny, Arun Kumar Shanmugam, Mas Irfan P. Hidayat, and Totok R Biyanto. 2019. “Study of Lateral Vibration of Drilling String With Mass Imbalance Using Finite Element”. International Journal on Advanced Science, Engineering and Information Technology 9 (3):816-21. https://doi.org/10.18517/ijaseit.9.3.4478.