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2. Craswell ET and De Datta SK (1980) Recent developments in research on nitrogen fertilizers for rice. IRRI Research Paper Series 49, p 11
3. Craswell ET and Vlek PLG (1979) Fate of fertilizer nitrogen applied to wetland rice. In International Rice Research Institute, Nitrogen and Rice, pp 175?192. Los Baños, Philippines
4. Craswell ET and Vlek PLG (1979) Greenhouse evaluation of nitrogen fertilizers for rice. Soil Sci Soc Am J 44, 1184?1188
5. De Datta SK (1978) Fertilizer management for efficient use in wetland rice soils. In Soils and Rice, pp 671?701. Los Baños, Philippines: International Rice Research Institute