Textual material that names the parties who the author wishes to thank or recognize for their assistance in, for example, producing the work, funding the work, inspiring the work, or assisting in the research on which the work is based.
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The following, in order:
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An acknowledgments in the back matter of a book:
...
<book-back>
<ack id="bid.394">
<title>Acknowledgments</title>
<p>We gratefully acknowledge the work of Vladimir Soussov,
as well as the entire NCBI Entrez team, especially Grisha
Starchenko, Vladimir Sirotinin, Alexey Iskhakov, Anton
Golikov, and Pramod Paranthaman. We thank Jim Ostell for
guidance, ...</p>
</ack>
<ref-list>...</ref-list>
</book-back>
...