DETERMINATION AND INVESTIGATION OF POLLUTION OF THE NIR RIVER IN ARDABIL PROVINCE OF IRAN. Proceedings of the YSU B: Chemical and Biological Sciences, [S. l.], v. 46, n. 1 (227), p. 59–63, 2012. DOI: 10.46991/PYSUB.2012.46.1.059. Disponível em: https://journals.ysu.am/index.php/proceedings-chem-biol/article/view/vol46_no1_2012_pp059-063. Acesso em: 21 jan. 2026.