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陕西省南郑县户用沼气池经济效益分析
王征兵, 孟君望
Analysis of Economic Effect of Methane-Generating Pits in Family in Nanzheng County, ShaanXi Province
Wang Zhengbing, Meng Junwang
生态学杂志 . 1999, (1): 66 -68 .