units Units

The units of measure in which the size or length of a cited work is expressed (for example, a @units value may record “pages”, “minutes”, “seconds”, or “linear-feet”).
REQUIRED on element: <size>
Value Meaning
Text, numbers, or special characters Names the units of measure in which the size is expressed, for example, “MB”.
Restriction @units is required; it must be provided if the element is used.
Tagged Sample

@units for a cited proceedings’ page count

...
<element-citation publication-type="conf-proc">
 ...  
 <size units="pages">385 p</size>
 <comment>(Progress in brain research; vol. 147)</comment>
</element-citation>  
...
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