Effect of the self-purification of Oum Er Rbia river on the elimination of fish releasesKhadija Ouaissa, Assia Kritihi, Youness. Oumessoud, Abdelaziz Maychal and Mustapha HasnaouiE3S Web Conf., 150 (2020) 02009DOI: https://doi.org/10.1051/e3sconf/202015002009