function findDocument()
{
$t = new Documents();
$db = $t->getAdapter();
$s = $t->select()->setIntegrityCheck(false)->distinct()->from('document')->join('article_document', 'article_document.document = document.id', array())->where('article_document.article = ?', $this->id)->limit(1);
return $t->fetchOne($s);
}
