“ Choose a column width that is appropriate for the average width of the references on the page.
Columns are currently supported by browsers such as Mozilla Firefox, Google Chrome, Safari and Opera. See below for more information.
The use of columns can result in widows and orphans, where a citation at the bottom of a column may be split to the top of the next column. There are CSS3 selectors that could resolve this, but they are not yet supported by any major browsers. ”

“ Example: |2|. column-width: a typographic unit of measurement such as em, specifying the width for the reference list columns. Example: |30em|. colwidth: explicitly sets the column-width; do not use close with this parameter— it is not needed and it will cause colwidth to not work. refs: used with named references (e.g., ) ; it specifies a list of some or all named references used in the article. group: identifies by name the subset of references to be rendered ”