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The use of caffeine as a chemical marker of domestic wastew..:

Eline Simões Gonçalves ; Silvana Vianna Rodrigues ; Emmanoel Vieira da Silva-Filho
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1980-993X2017000200192&lng=pt&nrm=iso&tlng=en.  , 2017