Lubis, P.K.D. et al. 2026. Eco-Efficiency Sawit Sumut: Memangkas Biaya Produksi PKS Melalui Manajemen Limbah Berkelanjutan. RIGGS: Journal of Artificial Intelligence and Digital Business. 5, 2 (May 2026), 5396–5403. DOI:https://doi.org/10.31004/riggs.v5i2.9389.