<!ELEMENT nlm-citation ((person-group | collab)*, (article-title | trans-title)*, source?, patent?, trans-source?, year?, ((month?, day?, time-stamp?) | season?), access-date?, volume?, edition?, conf-name?, conf-date?, conf-loc?, (issue | supplement)*, publisher-loc?, publisher-name?, (fpage?, lpage?)*, page-count?, series?, comment*, pub-id*, annotation?) >
...
<ref>
<nlm-citation publication-type="journal">
<person-group>...</person-group>
<article-title>Electrogastrographic study of patients with
unexplained nausea, bloating and vomiting</article-title>
<source>Gastroenterology</source>
<year iso-8601-date="1980-08">1980</year>
<month>08</month>
<volume>79</volume>
<issue>2</issue>
<fpage>311</fpage>
<lpage>314</lpage>
</nlm-citation>
</ref>
...
Journal Archiving and Interchange Tag Library NISO JATS Draft Version 1.1d2
Version of December 2014