Caffeine, surfactants and organic matter in a high Andean River: Chumbao River case, Apurimac, Peru by David Choque-Quispe, Ruth Karina Herbas-De la Cruz, Carlos A. Ligarda-Samanez, Aydeé M. Solano-Reynoso, Dianeth Buleje-Campos, Yudith Choque-Quispe, Jenny C. Muñoz-Saenz, Zaida Olinda Pumacayo-Sanchez, Liliana Asunción Sumarriva-Bustinza, Nikol Alexsandra Silvera Ticona

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