середина . EKI Combined Dictionary 2026. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif/dlall/eki/%D1%81%D0%B5%D1%80%D0%B5%D0%B4%D0%B8%D0%BD%D0%B0/1/rus (20.06.2026)
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середина . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D1%81%D0%B5%D1%80%D0%B5%D0%B4%D0%B8%D0%BD%D0%B0/1/rus (20.06.2026)
середина . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D1%81%D0%B5%D1%80%D0%B5%D0%B4%D0%B8%D0%BD%D0%B0/1/rus (20.06.2026)