"Cyrillic: Range: 0400–04FF"(PDF). The Unicode Standard, Version 6.0. 2010. p. 42. Archived(PDF) from the original on 13 May 2011. Retrieved 2011-05-21.
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"Cyrillic: Range: 0400–04FF"(PDF). The Unicode Standard, Version 6.0. 2010. p. 42. Archived(PDF) from the original on 13 May 2011. Retrieved 2011-05-21.