LaTeX.org

:) Solve problem with perl, simply cutting construction in [] brackets after \bibitem:

#!/usr/bin/perl
#(k)

$newfile = $ARGV[0]."_cpy";
rename $ARGV[0], $newfile;
unlink $ARGV[0];
open(my $fh, '>', $ARGV[0]);


open (CONF1, $newfile);
@lines_text = <CONF1>;
close CONF1;

$flag=0;
foreach $line ...

Hello all!

BiBtex generates bibitem with optional label field, in []:

\bibitem[Christen and
Carlen(2000)]{ChristenCarlen2000}\selectlanguageifdefined{english}
\BibEmph{Christen~T., Carlen~M.~W.} Theory of ragone plots~//
\href{http://dx.doi.org/10.1016/S0378-7753(00)00474-2}{\BibEmph{Journal of ...