= The International System of Units (SI), ninth edition, SI Brochure
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{title2=2019}
Publisher: Bureau International des Poids et Mesures.
Online text: https://www.bipm.org/documents/20126/41483022/SI-Brochure-9.pdf
Cited passages: International Bureau of Weights and Measures, SI Brochure, ninth edition: section 2.2, printed pp. 123–125 (defining constants and alpha relation); section 2.3.1, printed p. 128 (ampere, epsilon0 and mu0); 26th CGPM Resolution 1, printed p. 194 (20 May 2019 effective date).
Online text: https://www.bipm.org/documents/d/guest/si-brochure-9-2_01
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