public static function absoluteReference($pCoordinateString = 'A1')
	{
		if (strpos($pCoordinateString,':') === FALSE && strpos($pCoordinateString,',') === FALSE) {
			// Split out any worksheet name from the reference
			$worksheet = '';
			$cellAddress = explode('!',$pCoordinateString);
			if (count($cellAddress) > 1) {
				list($worksheet,$pCoordinateString) = $cellAddress;
			}
			if ($worksheet > '')	$worksheet .= '!';

			// Create absolute coordinate
			if (ctype_digit($pCoordinateString)) {
				return $worksheet . '$' . $pCoordinateString;
			} elseif (ctype_alpha($pCoordinateString)) {
				return $worksheet . '$' . strtoupper($pCoordinateString);
			}
			return $worksheet . self::absoluteCoordinate($pCoordinateString);
		}

		throw new PHPExcel_Exception('Cell coordinate string can not be a range of cells');
	}