Kuever, J., C. Wawer, and R. Lillebaek. “Microbiological Observations in the Anoxic Basin Golfo Dulce, Costa Rica”. Revista De Biología Tropical, vol. 44, no. S3, Dec. 1996, pp. 49–57, https://revistas.ucr.ac.cr/index.php/rbt/article/view/29405.