Ref Man for my contribution

I'll be happy if this could be proofread before I merge ...
If you use `hyperref` and make a pdf from this, you might want to consider
```latex
\subsection{\texorpdfstring{\textt{cbn}}{cbn} and \texorpdfstring{\texttt{simpl}}{simpl}}
```
to silence warnings about font changes not being permitted in pdf labels.