docs: "References" page added

docs/appendix/references.md

@@ -0,0 +1,15 @@
+# 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.
+
+[`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.
+
+[`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).

docs/getting_started/faq.md

@@ -2,7 +2,8 @@
 
 ## Why do we spell `metre` instead of `meter`?
 
-This is how ISO 80000 defines it (British English spelling by default).
+This is how the BIPM defines it in the [SI Brochure](../../appendix/references/#SIBrochure)
+(British English spelling by default).
 
 
 ## Why don't we use UDLs to create quantities?
@@ -126,8 +127,10 @@ all the properties of scaled units and is consistent with the rest of the librar
 
 ## Why Unicode quantity symbols are used by default instead of ASCII-only characters?
 
-Both C++ and ISO 80000 are standardized by the ISO. ISO 80000 and the SI standards specify Unicode symbols
+Both C++ and [ISO 80000](../../appendix/references/#ISO80000) are standardized by the ISO.
-as the official unit names for some quantities (i.e. `Ω` symbol for the resistance quantity).
+[ISO 80000](../../appendix/references/#ISO80000) and the [SI](../../appendix/references/#SIBrochure)
+standards specify Unicode symbols as the official unit names for some quantities
+(i.e. `Ω` symbol for the resistance quantity).
 As **mp-units** library will be proposed for standardization as a part of the C++ Standard Library
 we have to obey the rules and be consistent with ISO specifications.
 

mkdocs.yml

@@ -109,3 +109,4 @@ nav:
   - Appendix:
       - Glossary: appendix/glossary.md
       - Release Notes: appendix/release_notes.md
+      - References: appendix/references.md