citation-style-language/styles — pull request #150 by fbennett (2012-05-11 15:00:35+00:00)
Title: chicago-note-bibliography.csl: discrete sort keys

This separates a string used for sorting into separate keys, addressing an issue raised by a user in this thread:

http://forums.zotero.org/discussion/23276/different-works-by-same-author-listed-without-dash-replacing-authors-name/