One thing I'm seeing in your Excel-handling Perl is that you never write to the spreadsheet, nor do you save the Excel file. When using Win32::OLE, opening a file opens it for read/write, so you don't have to do anything differently there. The other thing I'm not sure about is your inner foreach loop -- why is it there at all if you only have one column? Not wrong per se, just curious.

Saving to Excel is really simple. Using kennethk's code (in this node), just add one line (with some surrounding lines to show location):

if ($citedby){
    print "\"$title\"\nCited by: $citedby\n\n";
    # Assuming you want to save the "cited" info in the
    # column just to the right of the current cell, adjust
    # as desired.
    $Sheet->Cells($row,$col+1)->{Value} = $cited;
}
[download]

Then, of course, you'll want to call $Book->Save(); before you close the workbook.