private function extractDocumentsLink($html){
        $links = array();
        //preg_match_all("#<a\ href=\"(.*)\.pdf\"#", $html, $matches);
        preg_match_all("#<a\ href=\"(.*)\"#", $html, $matches);
        foreach($matches[1] as $f) {
            $pospdf = strpos($f,".pdf");
            if($pospdf !== false) {
                $f = substr($f, 0, $pospdf + 4);
                if (!$this->excludeLink($f)) {
                    $links[] = $f;
                }
            }
        }
        return $links;
    }