D. Wahyuni, H. Suriono, S. Malawat, H. Subagiharti, and R. P. Sihombing, “Analysis of the Influence of Productivity and Efficiency of the Plantation Sector on the Island of Sumatra with DEA and MPI Approaches”, SoL, vol. 2026, no. 2, pp. 66–72, Feb. 2026, doi: 10.55284/km6yfn21.