...
<ref>
<element-citation publication-type="paper">
<name><surname>Thabet</surname>
<given-names>A</given-names></name>
<article-title>Clinical value of two serial pulmonary
embolism-protocol CT studies performed within ten
days</article-title>
<conf-name>Annual Scientific Meeting and Postgraduate
Course of the American Society of Emergency Radiology</conf-name>
<conf-date iso-8601-date="2006-09-27">2006 Sep 27-30</conf-date>
<conf-loc>Washington, DC</conf-loc>
</element-citation>
</ref>
...

                  
...
<ref>
<mixed-citation publication-type="paper">
<string-name><surname>Thabet</surname>
<given-names>A</given-names></string-name>.
<article-title>Clinical value of two serial pulmonary
embolism-protocol CT studies performed within ten days</article-title>.
<conf-name>Annual Scientific Meeting and Postgraduate Course
of the American Society of Emergency Radiology</conf-name>;
<conf-date iso-8601-date="2006-09-27">2006 Sep
27-30</conf-date>; <conf-loc>Washington, DC</conf-loc>.
</mixed-citation>
</ref>
...