如何从 Gost 风格的参考文献中删除网页链接？

Question

我需要从以 Gost 风格生成的文献参考文献中删除 DOI 和 Pubmed 等网络链接。哪些函数和代码行负责此操作？

参考如下：

Weyn, B. 根据分形和句法结构分析测量的血管生成相关血管模式确定肿瘤预后 / B. Weyn、WA Tjalma、P. Vermeylen 等人。//临床肿瘤学（RColl Radiol）。— 2004 年。— 第 16 卷第 4 期。— 第 307-316 页。— http：//www。ncbi。nlm。nih。gov/，pubmed/15214656。

我需要删除 http 链接。

%%
%% This is file `gost780s.bst',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% gost.dtx  (with options: `bst,sort')
%% 
%% This file may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%% The latest version of this license is in
%%   http://www.latex-project.org/lppl.txt
%% and version 1.3 or later is part of all distributions of LaTeX
%% version 2005/12/01 or later.
%% 
%% This file has the LPPL maintenance status "maintained".
%% Maintained by Igor A. Kotelnikov.
%% Current version: 2012.02.02
%% 
%% Please, send bug report via e-mail:
%%   kia999 at mail dot ru <Igor Kotelnikov>
%% or
%%   polyama at yahoo dot com <Maksym Polyakov>
%% 



%%
%% This bibstyle attempts to format bibliography according to
%% GOST 7.80-2000 for bibliographic records.

Here a part of code:

FUNCTION {format.url}
{ url empty$
    { "" }
       {
        "\BibUrl{ " url * "}" *
        urldate empty$
         { "" }
          { " (" bbl.urldate * ": " * urldate * ")" * }
       if$ *
     }
  if$
}

FUNCTION {format.annote}
{ annote empty$
    { "" }
{ after.sentence 'output.state :=
  "\BibAnnote{" annote add.period$ * "}" *
}
  if$
}

%%FUNCTION {format.isbn}
{
  %%isbn empty$
   %% { "" }
   %% { "ISBN:~\href{http://isbndb.com/search-all.html?kw=" isbn *
   %%   "}{" * isbn * "}" *
   %% }
  %%if$
}

FUNCTION {add.doi} { }

FUNCTION {add.medium} { }


FUNCTION {output.eprint.url}
{
  %%  format.url output
}