систематическая ошибка . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F%20%D0%BE%D1%88%D0%B8%D0%B1%D0%BA%D0%B0/1/rus (21.06.2026)
систематическая ошибка . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F%20%D0%BE%D1%88%D0%B8%D0%B1%D0%BA%D0%B0/1/rus (21.06.2026)
