In certain papers, " bf " appears just before the volume of a cited item. It is believed that this is a mistyped TeX command for making the volume "bold" in the paper. The line may look something like this after numeration has been recognised: M. Bauer, B. Stech, M. Wirbel, Z. Phys. bf C : <cds.VOL>34</cds.VOL> <cds.YR>(1987)</cds.YR> <cds.PG>103</cds.PG> The " bf " stops the title from being correctly linked with its series and/or numeration and thus breaks the citation. Added a pattern to recognise this situation and to strip out the " bf " after the numeration-recognition pass, so that citations are not missed because of this sitatuation.