Functional group analysis of cigarette butts in beach sand and their association with microplastics: Bocagrande Beach, Cartagena, Colombia. - Díaz-Mendoza, Claudia; Mouthon-Bello, Javier; Botero, Camilo M.; Valdelamar Villegas, Juan; Gutiérrez, Leonardo; Martinez-Villadiego, Keydis (PLoS ONE, 2026)