public static function extractSheetTitle($pRange, $returnRange = false)
    {
        // Sheet title included?
        if (($sep = strpos($pRange, '!')) === false) {
            return '';
        }

        if ($returnRange) {
            return array(trim(substr($pRange, 0, $sep), "'"), substr($pRange, $sep + 1));
        }

        return substr($pRange, $sep + 1);
    }