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inimkõrvale kuuldamatu madala sagedusega (alla 16 Hz) heli
инфразвук . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/%D0%B8%D0%BD%D1%84%D1%80%D0%B0%D0%B7%D0%B2%D1%83%D0%BA/1/rus (29.08.2026)