Nugroho, O. A., A. R. K. . Widhi, and S. . Kumbarasari. “The Design of a Motorized Palm Portable Harvesting Tool Using a Flexible Shaft”. Jurnal Penelitian Kelapa Sawit, vol. 30, no. 2, Aug. 2022, pp. 83-94, doi:10.22302/iopri.jur.jpks.v30i2.183.