Varina F, Hartoyo S, Kusnadi N, Rifin A. The Determinants of Technical Efficiency of Oil Palm Smallholders in Indonesia. IJEFI [Internet]. 2020 Nov. 4 [cited 2025 Jan. 25];10(6):89-93. Available from: https://mail.econjournals.org.tr/index.php/ijefi/article/view/10594