if($contents)
     {
      my $content_data=get($contents);
      my $html2 = HTML::TreeBuilder->new();
      $html2->parse($content_data);
	 	 
       for my $p ($html2->look_down(_tag => 'p'))
      {
       next if($p->as_text() !~ /ISSN:/i);
	  }
	  if($p)
	  {
	      my $doi=$p->content()->[10];
          $values{doi}=$doi if($doi);
          my $issn=$p->content()->[12];
          $values{issn}=$issn if($issn);
	  }
	  $html2->delete();
    }