i have aded the -B option from heirloom to forsyth's port of refer, plus a simple script 'roffbib.rc' that makes complete bibliography from the database, plus a tmac.bib macro; the stuff is in:
/n/sources/contrib/pac/sys/src/ape/cmd/txt/refer.tgz
until, perhaps, forsyth will host it??
enjoy,

++pac.