Neurohr Bustamante, Erich, Julián Monge-Nájera, and María Isabel González Lutz. “Air Pollution in a Tropical City: The Relationship Between Wind Direction and Lichen Bio-Indicators in San José, Costa Rica”. Revista de Biología Tropical 59, no. 2 (June 1, 2011): 899–905. Accessed February 3, 2023. https://revistas.ucr.ac.cr/index.php/rbt/article/view/3148.