Wiskandar, Wiskandar, and Ajidirman Ajidirman. “Effect of Biochar and Tithonia Compost on Physical Properties of Post-Coal Mining Soil”. Journal of Degraded and Mining Lands Management 11, no. 3 (April 1, 2024): 5829–5838. Accessed June 25, 2024. https://jdmlm.ub.ac.id/index.php/jdmlm/article/view/15560.