1. Broadbent FE and De Datta SK (1984) Differences in response to nitrogen fertilizer by rice varieties/lines. Agronomy Abstract. 1984 Annual Meetings, American Soc Agron, Las Vegas, Nevada, USA
2. Cao Zhi-Hong, De Datta SK and Fillery IRP (1984) Effect of placement methods on floodwater properties and recovery of applied nitrogen (15N-labeled urea) in wetland rice. Soil Sci Soc Am J 48: 197–203
3. Craswell ET and Vlek PLG (1979) Fate of fertilizer nitrogen applied to wetland rice. In International Rice Research Institute. Nitrogen and rice, 175–192, Los Baños, Laguna, Philippines
4. Craswell ET and De Datta SK (1980) Recent developments in research on nitrogen fertilizers for rice. IRRI Research Paper Series 49, 11 pp
5. Craswell ET and Vlek PLG (1982) Nitrogen management for submerged rice soils. In Symposia Papers. II. Vertisols and rice soils of the tropics. Transactions 12th Cong Int Soil Sci 3:158–181, 8–16 February 1982, New Delhi