r2b-put-field
r2b-put-field is a compiled Lisp function in `refbib.el
'.
(r2b-put-field FIELD DATA &optional ABBREVS)
Print bibtex FIELD = {DATA} if DATA not null; precede
with a comma and newline; if ABBREVS list is given, then
try to replace the {DATA} with an abbreviation.