2.0 2025-04-30 ru 11.0.0 The Unicode Standard, Version 1.1 Internetstiftelsen i Sverige (IIS), Russian https://github.com/dotse/IDN-ref-tables/blob/master/language-tables/russian-lang-ref-table.txt accessed on 2016-10-16 RFC 5891, Internationalized Domain Names in Applications (IDNA): Protocol https://tools.ietf.org/html/rfc5891 RFC 5992, Internationalized Domain Names Registration and Administration Guidelines for European Languages Using Cyrillic - section 2.7 Russian https://tools.ietf.org/html/rfc5992 Omniglot Russian https://www.omniglot.com/writing/russian.htm Everson, Michael, The Alphabets of Europe, Russian https://evertype.com/alphabets/russian.pdf Everson, Michael, The Alphabets of Europe, Russian https://evertype.com/alphabets/russian.pdf The Unicode Consortium, Common Locale Data Repository - CLDR Version 28 (2015-09-16) - Locale Data Summary for Russian [ru]- https://www.unicode.org/cldr/charts/28/summary/ru.html Coordination Center for TLD RU (.ru Russia cctld) https://www.iana.org/domains/idn-tables/tables/ru_ru-ru_1.0.html