Within a citation, this is the title of a journal, book, conference proceedings, etc. that is the source of the cited material, but with the source name given in a different language from the source as given in the <trans-source> element.
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Any combination of:
...
<ref>
<mixed-citation id="c12" publication-type="book">
<person-group person-group-type="author">
<string-name><surname>Faure</surname>, <given-names>C.</given-names></string-name>
</person-group>
(<year>1995</year>).
<source>Vivre le deuil au jour le jour</source> [
<trans-source>Living daily with mourning</trans-source>].
<publisher-loc>Paris</publisher-loc>: <publisher-name>Albin Michel</publisher-name>.
</mixed-citation>
</ref>
...
references3.ent