Author: perezl.alonso Format: MarkdownItexfixed broken link of first reference
<a href="https://ncatlab.org/nlab/revision/diff/bialgebra+cocycle/11">diff</a>, <a href="https://ncatlab.org/nlab/revision/bialgebra+cocycle/11">v11</a>, <a href="https://ncatlab.org/nlab/show/bialgebra+cocycle">current</a>