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Grau, Felix ,  Drechsel, Nikita ,  Trautz, D. ,  Weerakody, J. ,  Ranaweera, B. ,  [Fertiliser derived from fecal sludge in Sri Lanka: analysis of plant nutritional value and heavy metal contamination] ,  Fertiliser derived from fecal sludge in Sri Lanka: analysis of plant nutritional value and heavy metal contamination