Publisher: Bureau International des Poids et Mesures.
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).
Additional inspected version: 4.01, June 2026; 2019 remains the original ninth-edition publication year. BIPM issues and hosts the brochure. Inspected locators: English §2.3.4, printed pp. 132–134, discussion and Table 4, notes (b), (c) and (g).
Cited passages: Appendix 2, v1.02, 22 March 2021, §3.1, printed pp. 2–3: wavelength convention, normalized functions and interpolation; §3.1, equation (2), printed p. 3: spectral weighting normalized at the defining frequency; §3.1, printed p. 3: photopic and scotopic luminous efficiency functions.

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