For citations:

Sobina E.P. State primary standard of units of specific adsorption of gases, specific surface area, specific pore volume, pore size, open porosity and gas permeability coefficient of solids and materials GET 210-2019. Izmeritel`naya Tekhnika. 2020;(12):3-12. (In Russ.) https://doi.org/10.32446/0368-1025it.2020-12-3-12