“Bioavailability of heavy metals as a consequence of the variation in the contraction of humic and fulvic acids in the sediment of the Collotacocha high Andean wetland”, Scién. Inge., vol. 18, no. 3, pp. 79–85, Sep. 2022, Accessed: Jul. 18, 2026. [Online]. Available: https://revistas.unitru.edu.pe/index.php/PGM/article/view/4812