Derivatives and Integrals An Annotated Discourse

      <appendix xml:id="references" label="appendix-multiple-references">
        <title>Multiple References</title>
        <subsection>
          <title>Multiple Specialized References</title>
          <p>
            You might want to have lists of references,
            in the back, but with multiple such lists.
            Make an <tag>appendix</tag> to hold them, give it some structure
            (for an <tag>article</tag>,
            a leading <tag>subsection</tag>,
            such as the one you are reading right now),
            then follow with multiple <tag>references</tag> divisions.
            A typical citation will then look like:
            <xref ref="biblio-strang-article-tres"/>.
          </p>
<!-- Notes to add once CSL processing is enabled: Note: we need at least one citation for an item to show up.  Note: look at the source to see sorting/reordering. -->
          <p>
            2025-05-23: currently testing citations to CSL-style references in the back matter.
            These should go eventually somewhere besides right where the references are.
            <ul>
              <li>Judson: <xref ref="biblio-judson-aata"/></li>
              <li>Lay: <xref ref="biblio-lay-article"/></li>
              <li>Doe: <xref ref="citeproc-py-item-3"/></li>
              <li>Doe, later: <xref ref="citeproc-py-item-3-later"/></li>
              <li>Conrey/Farmer: <xref ref="conrey-farmer"/></li>
              <li>D'Arcus: <xref ref="citeproc-py-item-5"/></li>
              <li>
                Two, authored in-order: <xref ref="conrey-farmer citeproc-py-item-5"/>
              </li>
              <li>
                Two, authored out-of-order: <xref ref="citeproc-py-item-5 conrey-farmer"/>
              </li>
              <li>
                Three, authored reverse-order:
                <xref ref="biblio-lay-article biblio-judson-aata citeproc-py-item-3"/>
              </li>
            </ul>
          </p>
        </subsection>
        <references>
          <title>General References</title>
          <biblio type="raw" xml:id="biblio-strang-article-uno">
            Gilbert Strang,
            <title>The Fundamental Theorem of Linear Algebra</title>,
            <journal>The American Mathematical Monthly</journal>
            November 1993,
            <volume>100</volume>
            <number>9</number>,
            848<ndash/>855.
          </biblio>
        </references>
        <references>
          <title>Specialized References</title>
          <biblio type="raw" xml:id="biblio-judson-AATA">
            Tom Judson,
            <title>Abstract Algebra: Theory and Applications</title>.
            <note xml:id="note-judson-AATA">
              <p>
                Another online, open-source offering.
              </p>
            </note>
          </biblio>
          <biblio type="raw" xml:id="biblio-strang-article-tres">
            Gilbert Strang,
            <title>The Fundamental Theorem of Linear Algebra</title>,
            <journal>The American Mathematical Monthly</journal>
            November 1993,
            <volume>100</volume>
            <number>9</number>,
            848<ndash/>855.
          </biblio>
        </references>
      </appendix>