Sandbox 1

This is a sample <ref>Richardson DC, Richardson JS. The kinemage: a tool for scientific communication.

Protein Sci. 1992 1:3-9. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/1304880 1304880]</ref> of the

standard references and one <ref>PMID:18673581</ref> with the PubmedID only new option <nowiki>"<ref>PMID:18673581</ref>"</nowiki>.

It's possible now to have additional references by adding them to the group '''xtra'''.

See this page source under ''Additional Literature and Resources''.

== References ==

<references/>

== Additional Literature and Resources ==

<ref group="xtra">PMID:15068885</ref>

<ref group="xtra">PMID:14749769</ref>

<ref group="xtra">PMID:1304880</ref>

<ref group="xtra">PMID:16270100</ref>

<ref group="xtra">PMID:14661029</ref>

<references group="xtra"/>

<p>&nbsp;</p>

Below shows putting all the additional references on one line eliminates the gap on the page created above when the extra items were listed on multiple lines to illustrate the feature clearly:

== Additional Literature and Resources ==

<ref group="xtra">PMID:15068885</ref><ref group="xtra">PMID:14749769</ref><ref group="xtra">PMID:1304880</ref><ref group="xtra">PMID:16270100</ref><ref group="xtra">PMID:14661029</ref> <!--Putting all on one line eliminates excess blank space where they are added-->

<references group="xtra"/>