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riist Päikese otsekiirguse suhteliseks mõõtmiseks
актинометр . Limnoloogia sõnastik. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//lim/%D0%B0%D0%BA%D1%82%D0%B8%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80/1/rus (18.08.2026)