Syaf, H., M. A. Pattah, and L. M. H. Kilowasid. “Quality of Soil from the Nickel Mining Area of Southeast Sulawesi, Indonesia, Engineered Using Earthworms (Pheretima sp.)”. Journal of Degraded and Mining Lands Management, vol. 8, no. 4, July 2021, pp. 2995-0, doi:10.15243/jdmlm.2021.084.2995.