Priyono, J., and Z. Arifin. “Adding Organic Matter Enhanced the Effectiveness of Silicate Rock Fertilizer for Food Crops Grown on Nutritionally Disorder Soils: A Glasshouse Assessment”. JOURNAL OF TROPICAL SOILS, vol. 17, no. 2, Nov. 2012, pp. 97-104, doi:10.5400/jts.2012.v17i2.97-104.