Setyawan, Dwi, Robert Gilkes, and David Tongway. 2019. “Nutrient Cycling Index in Relation to Organic Matter and Soil Respiration of Rehabilitated Mine Sites in Kelian, East Kalimantan”. JOURNAL OF TROPICAL SOILS 16 (3):219-23. https://doi.org/10.5400/jts.2011.v16i3.219-223.