# References [`ISO80000`](#ISO80000){ #ISO80000 } : [ISO 80000-1:2009(E) "Quantities and units — Part 1: General"](https://www.iso.org/standard/30669.html), International Organization for Standardization. [`Quincey`](#Quincey){ #Quincey } : ["Angles in the SI: a detailed proposal for solving the problem](https://arxiv.org/pdf/2108.05704.pdf), Quincey, Paul (1 October 2021). [`SIBrochure`](#SIBrochure){ #SIBrochure } : [The International System of Units (SI)](https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf), International Bureau of Weights and Measures (20 May 2019), ISBN 978-92-822-2272-0.