public function group($groupname, $request) {
        $options = array(
            'videos', 'users', 'info'
        );
        if (!in_array($request, $options)) {
            throw new Garp_Service_Vimeo_Exception(
                'Invalid request. Available options are ' . implode(', ', $options)
            );
        }
        return $this->request('group/' . $groupname . '/' . $request);
    }