Sources
- UTS #35: Unicode LDML: Numbers. (Unicode) Accessed September 21, 2019.
- Number Patterns - CLDR - Unicode Common Locale Data Repository. Accessed September 21, 2019.
- Number Symbols - CLDR - Unicode Common Locale Data Repository. Accessed September 22, 2019.
- CLDR Releases/Downloads - CLDR - Unicode Common Locale Data Repository. Accessed September 22, 2019.
- Wikipedia: NaN
- Wikipedia: Floating-point arithmetic
- Wikipedia: Arbitrary-precision arithmetic
- Wikipedia: bc (programming language)
- PHP: BCMath Arbitrary Precision Mathematics
- Goldberg, David. What Every Computer Scientist Should Know About Floating Point Arithmetic, 1991.
- How to install php-bcmath on Ubuntu 16.04 (Xenial Xerus)