public function GetServiceTA($service, $continue = TRUE)
	{
		if (file_exists($this->TA_FOLDER.'TA-'.$this->options['CUIT'].'-'.$service.'.xml')) {
			$TA = new SimpleXMLElement(file_get_contents($this->TA_FOLDER.'TA-'.$this->options['CUIT'].'-'.$service.'.xml'));

			$actual_time 		= new DateTime(date('c',date('U')+600));
			$expiration_time 	= new DateTime($TA->header->expirationTime);

			if ($actual_time < $expiration_time) 
				return new TokenAutorization($TA->credentials->token, $TA->credentials->sign);
			else if ($continue === FALSE)
				throw new Exception("Error Getting TA", 5);
		}

		if ($this->CreateServiceTA($service)) 
			return $this->GetServiceTA($service, FALSE);
	}