bibtex-pop-previous
bibtex-pop-previous is an interactive compiled Lisp function in `bibtex.el
'.
(bibtex-pop-previous ARG)
Replace text of current field with the similar field in previous entry.
With arg, goes up ARG entries. Repeated, goes up so many times. May be
intermixed with M-x bibtex-pop-next (bibtex-pop-next).