Author: Tim_Porter Format: MarkdownItexAdded a reference. More to come.
<a href="https://ncatlab.org/nlab/revision/diff/Bernhard+Keller/6">diff</a>, <a href="https://ncatlab.org/nlab/revision/Bernhard+Keller/6">v6</a>, <a href="https://ncatlab.org/nlab/show/Bernhard+Keller">current</a>