Jeremia Hutauruk, E. Harso Kardhinata, Ihsan Effendi. CALCULATION OF OIL PALM HARVESTER PREMIUM BASED ON SLOPE CLASS BASED ON GEOGRAPHIC INFORMATION SYSTEM IN SEI SILAU PLANTATION PT.PERKEBUNAN NUSANTARA III (PERSERO). IJEBAS [Internet]. 2024 Feb. 19 [cited 2026 Apr. 17];4(1):284-96. Available from: https://radjapublika.com/index.php/IJEBAS/article/view/1431