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(label?, (citation-alternatives | element-citation | mixed-citation | nlm-citation | note | x)+)
<article dtd-version="1.1d2"> ... <back> <ack>...</ack> <ref-list> <ref id="B1"> <element-citation publication-type="commun" publication-format="web"> <person-group person-group-type="author"> <name> <surname>Harris</surname> <given-names>Pat</given-names> </name> </person-group> <article-title>New Z39.50 resource</article-title> <comment>[Internet]</comment> <source>Message to: Karen Patrias</source> <date-in-citation content-type="time-stamp" iso-8601-date="1998-02-27T13:18">1998 Feb 27, 1:18 pm</date-in-citation> <date-in-citation content-type="access-date" iso-8601-date="1998-02-28">[cited 1998 Feb 28]</date-in-citation> <comment>[about 2 screens]</comment> </element-citation> </ref> <ref id="B2"> ... </ref> ... </ref-list> </back> </article>
<article dtd-version="1.1d2"> ... <back> <ack>...</ack> <ref-list> <ref id="B1"> <mixed-citation publication-type="commun" publication-format="web"> <person-group person-group-type="author"> <name> <surname>Harris</surname><given-names>Pat</given-names> </name> </person-group>. <article-title>New Z39.50 resource</article-title> [Internet]. <source>Message to: Karen Patrias</source>. <date-in-citation content-type="time-stamp" iso-8601-date="1998-02-27T13:18">1998 Feb 27, 1:18 pm</date-in-citation> [cited <date-in-citation content-type="access-date" iso-8601-date="1998-02-28">1998 Feb 28</date-in-citation>]. [about 2 screens].</mixed-citation> </ref> <ref id="B2"> ... </ref> ... </ref-list> </back> </article>
...
<ref id="c33">
<label>33.</label>
<note>
<p>While the samples appear homogeneous in terms of local variations in
transition energy and PL intensity, the response to external electric fields
is strongly inhomogeneous, which can most likely be attributed to local
variations in the AlGaN back contact conductivity as well as inhomogeneities
in the passivation process.</p>
</note>
</ref>
...
...
<ref id="c35">
<label>35.</label>
<note>
<p>The geometric optimization and electronic transport properties are
all calculated by a developed <italic>ab-initio</italic> software package
Atomistix ToolKit, which is based on the spin-polarized density-functional
theory combined with the non-equilibrium Greens functions. ...</p>
</note>
</ref>
...
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