1. ISO. ISO/IEC 10646-1:2000 (E) Information technology?Universal Multiple-Octet Coded Character Set (UCS)?Part 1: Architecture and Basic Multilingual Plane. Geneva, International Organization for Standardization, 2000.
2. UTF-7, a mail-safe transformation format of Unicode. RFC 2152, Internet Engineering Task Force, May 1997.
3. UTF-8, a transformation format of ISO 10646. RFC 2279, Internet Engineering Task Force, January 1998.
4. UTF-16, an encoding of ISO 10646. RFC 2781, Internet Engineering Task Force, February 2000.
5. UTF-5, a transformation format of Unicode and ISO 10646. Internet Draft, draft-jseng-utf5-01, January 2000. Original draft: Dürst M. Internationalization of domain names. Internet Draft. http://www.w3.org/International/1996/draft-duerst-dns-i18n-00.txt [December 1996].