Díaz-Mendoza, C., Mouthon-Bello, J., Botero, C. M., Villegas, J. V., Gutiérrez, L., Martinez-Villadiego, K. (2026). Functional group analysis of cigarette butts in beach sand and their association with microplastics: Bocagrande Beach, Cartagena, Colombia. PLoS ONE. https://doi.org/10.1371/journal.pone.0345311