3Lee C H,Chang C T,Tsai S L. Development and implementation of producer responsibility recycling system [J].Resources, Conservation and Recycling, 1998,24:121～135.
4Skjelhaugen O J. A farmer-operated system for recycling organic wastes [J]. Journal of Agriculture Engineering Research,1999,73:373～382.
5Akisawa A,Kang Y T,Shimazaki Y,et al. Environmentally friendly energy system models using material circulation and energy cascade-the optimization work [J].Energy, 1999,24:561～578.
6Granstedt. Increasing the efficiency of plant nutrient recycling within the agricultural system as a way of reducing the load to the environment-experience from Sweden and Finland [J].Agriculture,Ecosystems and Environment,2000,80: 69～185.
7Highfill J,McAsey M.An application of optimal control to the economics of recycling [J].SIAM Review,2001,43(4):679～693.
