«22». The Unicode® Standard: Version 12.0 – Core Specification. Mountain View, CA: The Unicode Consortium. 2019. p. 820. ISBN978-1-936213-22-1. Consultado el 24 de mayo de 2019. «Some variations of decimal digits are considered glyph variants and are not separately encoded. These include the old style variants of digits, as shown in Figure 22-7.»