Copying functions and giving credit

I needed a script to move bugs on table level, to move bugs from one
installation to another while copying over all required data (keywords,
profiles, attachments, etc). I know about importxml.pl but didn't like
it. Therefore I've written a script to do this. This will be used to
move bugs from 2.10 to 2.16 (different installations, isn't an upgrade).

In the script I used 3 functions from other Bugzilla files. These are:
 * lsearch (from globals.pl)
 * GroupDoesExist (from checksetup.pl)
 * AddBugGroup (from checksetup.pl)
The script also contains a function based upon quoteUrls from
globals.pl (to update the bug and attachment references in the
comments).

How should I give credit to the authors of these functions in the MPL
header? Should I take all developers mentioned at the top of each
original file (globals.pl, checksetup.pl)? Or the names appearing in the
2.16 functions as shown by cvsblame?

Thanks

-- 
Regards,
Olav