Use in place of <references/> when a smaller type size is desired, with optional control over the specific type size and the number of columns rendered (in browsers that implement CSS columns).

All parameters are optional.

first parameter (unnamed)
Font size; this sets the CSS font-size attribute ("12px", "10pt", "0.8em", etc.; default is "83%")
columns (or second parameter)
number of columns for references; this sets the CSS column-count and -moz-column-count attributes
group (needs to be called by name)
for named groups as per reference group
refx (needs to be called by name)
for including texts within <references /> where name reference only appears specifically in the body text itself. See Cite.