As part of a bibliographic reference, the container element for all information particular to a supplement, for any work published as a supplement; such information includes additional identification numbers, supplement titles, or supplement series information
<!ELEMENT supplement (#PCDATA %supplement-elements;)* >
Any combination of:
<citation> Citation; <related-article> Related Article Information
...
<ref id="pbio-0020328-Brown1">
<citation citation-type="journal">
<person-group person-group-type="author">
<name><surname>Brown</surname>
<given-names>PO</given-names></name>
<name><surname>Botstein</surname>
<given-names>D</given-names></name>
</person-group>
<article-title>Exploring the new world of the genome with
DNA microarrays</article-title>
<source>Nat Genet</source>
<year>1999</year>
<volume>21</volume>
<supplement>(Suppl 1)</supplement>
<fpage>33</fpage>
<lpage>37</lpage>
</citation>
</ref>
...
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