For citations:
Prokunin S.V., Shchipunov A.N., Dobrovolskiy V.I., Vengina D.A. State primary standard of hydrogen ions activity in aqueous solutions GET 54-2019. Izmeritel`naya Tekhnika. 2022;(9):14-17. (In Russ.) https://doi.org/10.32446/0368-1025it.2022-9-14-17
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