Correa-Ochoa, M. A., L. C. Vélez-Monsalve, and J. C. Saldarriaga-Molina. “Spatial Distribution of Lichen Communities and Air Pollution Mapping in a Tropical City: Medellín, Colombia”. Revista De Biología Tropical, vol. 69, no. 3, Aug. 2021, pp. 1107–1123, doi:10.15517/rbt.v69i3.46934.