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EVS-EN 50065-1:2017 Keskmised jõutrafod sagedusele 50 Hz seadme suurima lubatava kestevpingega mitte üle 36 kV. Osa 1, Üldnõuded = Medium power transformers 50 Hz, with highest voltage for equipment not exceeding 36 kV. Part 1, General requirements
Translator: Ülo Treufeldt, Author: Eesti Standardikeskus
Uuringu "Integratsiooni monitooring 2005" aruanneTallinna Ülikool. Rahvusvaheliste ja Sotsiaaluuringute Instituut, Raivo Vetik, Iris Pettai, Jüri Kruusvall, Ivi Proos, Marje Pavelson, Klara Hallik
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