1. K. T. Ingram, “Rainfed lowland rice: agricultural research for high-risk environments.,” Manila (Philippines) International Rice Research Inst., 248, (1995).
2. J. K. Ladha, Rainfed lowland rice: advances in nutrient management research IRRI, (1998).
3. A. K. Makarim et al., “System analysis and modeling applications to develop marginal lands in the southern route of West Java and Central Java,” 95 1995.
4. R. Tedjasarwana and K. Permadi, Effect of Zinc, Nitrogen and Phosphorus fertilizers on lowland rice production (Sukamandi, Rice Crops Research Institute, 1991).
5. K. Pirngadi and A. K. Makarim, “Increasing productivity of rice in rainfed rice fields through integrated crop management,” J. Food Crop. Agric. Res. 25 (2006).