SuswantoT., ShamshuddinJ., OmarS. S., MatP., and TehC., “Alleviating an Acid Sulfate Soil Cultivated to Rice (Oryza sativa) Using Ground Magnesium Limestone and Organic Fertilizer”, J. Il. Tan. Lingk., vol. 9, no. 1, pp. 1-9, Apr. 2007.