“Application of Chopper Machinery Technology from Oil Palm Fronds in Huta Gondang Rejo Nagori Bandar Tongah Bandar Hands, Regency of Simalungun”. Journal of Saintech Transfer 1, no. 2 (April 8, 2019): 135–142. Accessed February 4, 2026. https://idjpcr.usu.ac.id/jst/article/view/499.