1. Organic carbon;Allison,1965
2. Sustainable Rice Productivity and Methane Reduction Research Plan,1992
3. Sources of atmospheric methane: measurements in rice paddies and a discussion;Cicerone,1981
4. Lange's Handbook of Chemistry,1990
5. Effects of vegetation on the emission of methane from submerged paddy soil;Holzapfel-Pschorn;Plant and Soil,1986