Lubis, P. K. D., Purba, O. A., Purba, A. M. D., Gultom, O. S., & Veriyanto, J. (2026). Eco-Efficiency Sawit Sumut: Memangkas Biaya Produksi PKS Melalui Manajemen Limbah Berkelanjutan. RIGGS: Journal of Artificial Intelligence and Digital Business, 5(2), 5396–5403. https://doi.org/10.31004/riggs.v5i2.9389