ASSESSMENT OF ECOLOGICAL STATE OF THE VELIKAYA RIVER DELTA BASED ON HYDROCHEMICAL INDICATORS AND STRUCTURE OF PHYTOPLANKTON. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 1, p. 82–88, 2017. DOI: 10.17770/etr2017vol1.2650. Disponível em: https://archive-journals.rtu.lv/etr/article/view/4151.. Acesso em: 11 mar. 2026.