1. Introduction to energy use in wheat production;Briggle,1980
2. Energy use in crop systems in Northeastern China;Dazhong,1984
3. To evaluate labor energy in food production;Fluck;Agric. Eng.,1976
4. Energy sequestered in repairs and maintenance of agricultural machinery;Fluck;Trans. ASAE,1985
5. Agricultural Energetics;Fluck,1982