Template:SIbrochure9th
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International Bureau of Weights and Measures (2019-05-20), SI Brochure: The International System of Units (SI) (PDF) (9th ed.), ISBN 978-92-822-2272-0, archived (PDF) from the original on 2017-01-13 Lua error in Module:TNT at line 182: Missing Commons dataset I18n/Module:TNT.tab.
