коэффициент полезного действия механизма . Koolisõnastikud 2005–2010. Eesti Keele Instituut, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/%D0%BA%D0%BE%D1%8D%D1%84%D1%84%D0%B8%D1%86%D0%B8%D0%B5%D0%BD%D1%82%20%D0%BF%D0%BE%D0%BB%D0%B5%D0%B7%D0%BD%D0%BE%D0%B3%D0%BE%20%D0%B4%D0%B5%D0%B9%D1%81%D1%82%D0%B2%D0%B8%D1%8F%20%D0%BC%D0%B5%D1%85%D0%B0%D0%BD%D0%B8%D0%B7%D0%BC%D0%B0/1/rus (21.06.2026)
