【题 名】：Emergy Analysis of Human Carrying Capacity and Regional Sustainability: an Example Using the State of Maine  
            【作 者】： Daniel E. Campbell
            【期刊、会议、单位名称】：Environmental Monitoring and Assessment
            【年, 卷(期), 起止页码】：Volume 51, Numbers 1-2, 531-569,
            【全文链接】：http://www.springerlink.com/content/wq27754856524172/