public function getAllLastVersion()
	{
		$qb = $this->createQueryBuilder('p');
		$qb->where('p.original IS NULL AND p.state=:state')
			->setParameter(':state', DocumentModel::STATE_PUBLISHED);
		
		$result = $qb->getQuery()->getResult();
		$return = array();
		foreach($result as $original) {
			$return[] = $this->getLastVersion($original->getId());
		}
		return $return;
	}