- [1] UAX #11: East Asian Width ( 版) http://www.unicode.org/reports/tr11/
- [2] UAX #44: Unicode Character Database, , https://www.unicode.org/reports/tr44/#Default_Values_Table
- [3] UAX #44: Unicode Character Database, , https://www.unicode.org/reports/tr44/#Complex_Default_Values
- [4] UAX #44: Unicode Character Database, , https://www.unicode.org/reports/tr44/#Derived_Extracted
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