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http://mtc-m16b.sid.inpe.br/col/ltid.inpe.br/fernanda/2003/11.27.11.01/doc/Gases%20(CH4,%20CO2%20and%20N2)%20and%20pore%20Water%20Chemistry%20in%20the%20Surface%20Sediments%20of%20Lake%20Orta,%20Italy%20-%20Acidification%20Effects%20on%20C%20and%20N%20Gas%20Cycling.PDF