A program called *bib* appears to exist (or have once existed) that was supposedly similar or identical to *refer*. However, aside from a few fleeting references to its existence on Wikipedia <https://en.wikipedia.org/wiki/Troff#Preprocessors> and Troff.org <http://www.troff.org/prog.html>, I'm finding very little info on the program.
Does anybody know how it differed from the more familiar *refer* program that's bundled with the GNU suite? Googling has tossed up a few similar-sounding names like *roffbib* and *addbib*, but it's unclear if they're at all related..
