> The following extensions of refer exist in Heirloom and the known
> refer history.
>
> 1) `refer.man' cites under `FILES':
> file.i Index files.
>
> But I couldn't find this file type and no documentation for them.
Those files are created by `indxbib'.
> 2) `refer.man' cites under `FILES':
> /usr/dict/papers/Ind Default database.
>
> That file does not exist. The directory for such a file should
> be in the groff directory under /usr/local/share.
Mhmm. Basically, you are right. However, given that groff's `refer'
implementation doesn't come with a default database, I see no urgent
reason to change that. For practically all purposes, you don't use
the default but your own one, which can be specified with option `-p'.
> 3) Moreover some `refer' database directory would be nice.
This would be useful.
> 4) The programs in Heirloom and refer history
> - addbib
> - roffbib
> - sortbib
> might be useful as well.
Maybe, but there was no single request to add them over the years...
Werner