Khairul, Khairul, Ajidirman, and Sunarti. “The Physico Chemical Properties of Coal Mined Soil and Soybean Yield under Ameliorant Residue of In Situ Bituminous Coal and Its Coal Impurities”. Akta Agrosia 25, no. 2 (December 30, 2022): 52–61. Accessed May 7, 2024. https://ejournal.unib.ac.id/Agrosia/article/view/25581.