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L<Encode>, L<Encode::Unicode::UTF7>, L<http://www.unicode.org/glossary/>,
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L<http://www.unicode.org/unicode/faq/utf_bom.html>,
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The whole Unicode standard L<http://www.unicode.org/unicode/uni2book/u2.html>
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Ch. 15, pp. 403 of C<Programming Perl (3rd Edition)>
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O'Reilly & Associates; ISBN 0-596-00027-8