“Determination of Heavy Metals (Pb and Cd) in Guava Pulps (psidium Guajava) Obtained in the City of Cartagena”. BISTUA Revista de la Facultad de Ciencias Básicas 17, no. 2 (August 5, 2019): 137–143. Accessed October 15, 2025. https://ojs.unipamplona.edu.co/index.php/bistua/article/view/242.