[1] [CITE@en[GitHub - unified-font-object/ufo-spec: The official Unified Font Object specification source files.]], [TIME[2023-08-25T09:16:18.000Z]] <https://github.com/unified-font-object/ufo-spec>

[2] [CITE[Overview]], [TIME[2023-07-07T11:31:09.000Z]], [TIME[2023-08-25T09:16:31.249Z]] <https://unifiedfontobject.org/>