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X-ray microanalytical studies on ciliate protozoa in activated sludge |
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| Affiliation: | 1. Michigan State University, Department of Agricultural, Food and Resource Economics, 446 W. Circle Drive, Agriculture Hall, East Lansing, MI 48824, USA;2. Purdue University, Department of Agricultural Economics, 403 West State Street, West Lafayette, IN 47907, USA;3. China Agricultural University, Department of International Trade, No. 16, Qinghua East Road, Haidian District, Beijing 100083, PR China |
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