Varina, Firna, Sri Hartoyo, Nunung Kusnadi, and Amzul Rifin. “EFFICIENCY OF OIL PALM SMALLHOLDERS IN INDONESIA: A META-FRONTIER APPROACH”. Jurnal Manajemen & Agribisnis 17, no. 3 (November 30, 2020): 217. Accessed January 29, 2023. https://jagb.journal.ipb.ac.id/index.php/jmagr/article/view/34144.