1. Biomass Yield and Biofuel Quality of Switchgrass Harvested in Fall or Spring
2. I. Ahmed, J. Decker, and D. Morris .1994 .How much energy does it take to make a gallon of soydiesel? Institute for Local Self-Reliance, Minneapolis, Minnesota, USA.
3. ASAE [American Society of Agricultural Engineers]., 2000 .Agricultural machinery management. ASAE D497.4 and EP496.2 .InASAE standards, 47th edition. ASAE, Saint Joseph, Michigan, USA.
4. R. C. Brown, 2003 .Biorenewable resources: engineering new products from agriculture. Iowa State Press, Ames, Iowa, USA.
5. Carbon Storage in Soils of the North American Great Plains: Effect of Cropping Frequency