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SCHOeDER AND AL: "A generation of microbial fuel cells with current outputs boosted by more than one order of magnitude" ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, vol. 42, 2003, pages 2880-2883, XP002360454 cited in the application;  IEROPOULOS I A ET AL: "Comparative study of three types of microbial fuel cell" ENZYME AND MICROBIAL TECHNOLOGY, STONEHAM, MA, US, vol. 37, no. 2, 1 July 2005 (2005-07-01), pages 238-245, XP004889710 ISSN: 0141-0229;  K. RABAEY AND AL: "tubular microbial fuel cells for efficient electricity generation" ENVIRONMENTAL SCIENCE AND TECHNOLOGY, vol. 39, no. 20, 20 September 2005 (2005-09-20), XP002428053;  K. 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