трижды . EKI Combined Dictionary 2026. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif/dlall/eki/%D1%82%D1%80%D0%B8%D0%B6%D0%B4%D1%8B/1/rus (21.06.2026)
Translations
трижды . Matemaatika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mat/%D1%82%D1%80%D0%B8%D0%B6%D0%B4%D1%8B/1/rus (21.06.2026)