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Func=Search
Form=HomePage
...
end_year=2004
General+Search.x=2
General+Search.y=2

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$res = $ua->request(POST 'http://wos4.isiknowledge.com/CIW.cgi',
            [Func => 'Search',
...
             end_year => 2004,
             'General Search.x' => 2,
             'General Search.y' => 2]);