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Часть 21977 / с. 110-111 https://www.ester.ee/record=b1308855*est Об определении экологических ПДК для минеральных форм азота, фосфора и кремния в водных объектахSäärekõnno, JüriTallinna Tehnikaülikooli Toimetised1990 / lk. 32-36: ill Результаты исследования работы канализационных очистных сооружений в колхозе "Рахва Выйт" и проблема удаления фосфора из стоковMölder, Heino; Lääne, AinВопросы сельского строительства : материалы научно-технической конференции по мелиорации и сельскому строительству. 1, Секция сельского строительства1970 / с. [?] https://www.ester.ee/record=b1356174*est Симультанное осаждение фосфораVelner, Harald-Adam; Mölder, Heino; Ennet, PeeterМатериалы V Всесоюзного научного симпозиума по современным проблемам самоочищения и регулирования качества воды, Таллин, 18-21 ноября 1975 года. VI секция, Доочистка сточных вод1975 / с. 11-16 https://www.ester.ee/record=b1327859*est Удаление фосфора на малых аэрационных сооружений канализацииMölder, Heino; Ennet, PeeterАнтропогенное эвтрофирование природных вод : (тезисы докладов на Втором всесоюзном совещаний по антропогенному эвтрофированию природных вод), Звенигород, [19-23] дек. 1977 г. : [в 2-х частях]1977 / с. 301-304 https://www.ester.ee/record=b2951063*est Экологи: каждый может внести вклад в очистку моря от мусораStolitsa.ee2023 Экологи: каждый может внести вклад в очистку моря от мусора