LAFONT, Michel. “A Conceptual Approach to the Biomonitoring of Freshwater: The Ecological Ambience System”. Journal of Limnology 60, no. s1 (September 1, 2001): 17-24. Accessed January 19, 2021. https://www.jlimnol.it/index.php/jlimnol/article/view/jlimnol.2001.s1.17.