diff --git a/Classes/PHPExcel/Calculation/DateTime.php b/Classes/PHPExcel/Calculation/DateTime.php
index 854f8f8..3902924 100644
--- a/Classes/PHPExcel/Calculation/DateTime.php
+++ b/Classes/PHPExcel/Calculation/DateTime.php
@@ -56,6 +56,18 @@ class PHPExcel_Calculation_DateTime {
 	}	//	function _isLeapYear()
 
 
+	/**
+	 * Return the number of days between two dates based on a 360 day calendar
+	 *
+	 * @param	integer	$startDay		Day of month of the start date
+	 * @param	integer	$startMonth		Month of the start date
+	 * @param	integer	$startYear		Year of the start date
+	 * @param	integer	$endDay			Day of month of the start date
+	 * @param	integer	$endMonth		Month of the start date
+	 * @param	integer	$endYear		Year of the start date
+	 * @param	boolean $methodUS		Whether to use the US method or the European method of calculation
+	 * @return	integer	Number of days between the start date and the end date
+	 */
 	private static function _dateDiff360($startDay, $startMonth, $startYear, $endDay, $endMonth, $endYear, $methodUS) {
 		if ($startDay == 31) {
 			--$startDay;
diff --git a/Classes/PHPExcel/Calculation/Engineering.php b/Classes/PHPExcel/Calculation/Engineering.php
index 50c4902..b96f16d 100644
--- a/Classes/PHPExcel/Calculation/Engineering.php
+++ b/Classes/PHPExcel/Calculation/Engineering.php
@@ -741,8 +741,6 @@ class PHPExcel_Calculation_Engineering {
 
 
 	/**
-	 * _cleanComplex
-	 *
 	 * Cleans the leading characters in a complex number string
 	 *
 	 * @param	string		$complexNumber	The complex number to clean
@@ -756,20 +754,25 @@ class PHPExcel_Calculation_Engineering {
 		return $complexNumber;
 	}
 
-
-	private static function _nbrConversionFormat($xVal,$places) {
+	/**
+	 * Formats a number base string value with leading zeroes
+	 *
+	 * @param	string		$xVal		The "number" to pad
+	 * @param	integer		$places		The length that we want to pad this value
+	 * @return	string		The padded "number"
+	 */
+	private static function _nbrConversionFormat($xVal, $places) {
 		if (!is_null($places)) {
 			if (strlen($xVal) <= $places) {
-				return substr(str_pad($xVal,$places,'0',STR_PAD_LEFT),-10);
+				return substr(str_pad($xVal, $places, '0', STR_PAD_LEFT), -10);
 			} else {
 				return PHPExcel_Calculation_Functions::NaN();
 			}
 		}
 
-		return substr($xVal,-10);
+		return substr($xVal, -10);
 	}	//	function _nbrConversionFormat()
 
-
 	/**
 	 *	BESSELI
 	 *
diff --git a/Classes/PHPExcel/Calculation/Financial.php b/Classes/PHPExcel/Calculation/Financial.php
index d8e5195..4c42277 100644
--- a/Classes/PHPExcel/Calculation/Financial.php
+++ b/Classes/PHPExcel/Calculation/Financial.php
@@ -1523,14 +1523,11 @@ class PHPExcel_Calculation_Financial {
 		}
 	}	//	function NPER()
 
-
 	/**
 	 * NPV
 	 *
 	 * Returns the Net Present Value of a cash flow series given a discount rate.
 	 *
-	 * @param	float	Discount interest rate
-	 * @param	array	Cash flow series
 	 * @return	float
 	 */
 	public static function NPV() {
@@ -1553,7 +1550,6 @@ class PHPExcel_Calculation_Financial {
 		return $returnValue;
 	}	//	function NPV()
 
-
 	/**
 	 * PMT
 	 *
diff --git a/Classes/PHPExcel/Calculation/LookupRef.php b/Classes/PHPExcel/Calculation/LookupRef.php
index ba89a11..a22faff 100644
--- a/Classes/PHPExcel/Calculation/LookupRef.php
+++ b/Classes/PHPExcel/Calculation/LookupRef.php
@@ -251,8 +251,9 @@ class PHPExcel_Calculation_LookupRef {
 	 *
 	 * @access	public
 	 * @category Logical Functions
-	 * @param	string	$linkURL		Value to check, is also the value returned when no error
-	 * @param	string	$displayName	Value to return when testValue is an error condition
+	 * @param	string			$linkURL		Value to check, is also the value returned when no error
+	 * @param	string			$displayName	Value to return when testValue is an error condition
+	 * @param	PHPExcel_Cell	$pCell			The cell to set the hyperlink in
 	 * @return	mixed	The value of $displayName (or $linkURL if $displayName was blank)
 	 */
 	public static function HYPERLINK($linkURL = '', $displayName = null, PHPExcel_Cell $pCell = null) {
@@ -287,13 +288,14 @@ class PHPExcel_Calculation_LookupRef {
 	 *
 	 * NOTE - INDIRECT() does not yet support the optional a1 parameter introduced in Excel 2010
 	 *
-	 * @param	cellAddress		An array or array formula, or a reference to a range of cells for which you want the number of rows
+	 * @param	cellAddress		$cellAddress	The cell address of the current cell (containing this formula)
+	 * @param	PHPExcel_Cell	$pCell			The current cell (containing this formula)
 	 * @return	mixed			The cells referenced by cellAddress
 	 *
 	 * @todo	Support for the optional a1 parameter introduced in Excel 2010
 	 *
 	 */
-	public static function INDIRECT($cellAddress=Null, PHPExcel_Cell $pCell = null) {
+	public static function INDIRECT($cellAddress = NULL, PHPExcel_Cell $pCell = NULL) {
 		$cellAddress	= PHPExcel_Calculation_Functions::flattenSingleValue($cellAddress);
 		if (is_null($cellAddress) || $cellAddress === '') {
 			return PHPExcel_Calculation_Functions::REF();
@@ -307,29 +309,30 @@ class PHPExcel_Calculation_LookupRef {
 
 		if ((!preg_match('/^'.PHPExcel_Calculation::CALCULATION_REGEXP_CELLREF.'$/i', $cellAddress1, $matches)) ||
 			((!is_null($cellAddress2)) && (!preg_match('/^'.PHPExcel_Calculation::CALCULATION_REGEXP_CELLREF.'$/i', $cellAddress2, $matches)))) {
-
 			if (!preg_match('/^'.PHPExcel_Calculation::CALCULATION_REGEXP_NAMEDRANGE.'$/i', $cellAddress1, $matches)) {
 				return PHPExcel_Calculation_Functions::REF();
 			}
 
-			if (strpos($cellAddress,'!') !== false) {
-				list($sheetName,$cellAddress) = explode('!',$cellAddress);
+			if (strpos($cellAddress,'!') !== FALSE) {
+				list($sheetName, $cellAddress) = explode('!',$cellAddress);
+				$sheetName = trim($sheetName, "'");
 				$pSheet = $pCell->getParent()->getParent()->getSheetByName($sheetName);
 			} else {
 				$pSheet = $pCell->getParent();
 			}
 
-			return PHPExcel_Calculation::getInstance()->extractNamedRange($cellAddress, $pSheet, False);
+			return PHPExcel_Calculation::getInstance()->extractNamedRange($cellAddress, $pSheet, FALSE);
 		}
 
-		if (strpos($cellAddress,'!') !== false) {
+		if (strpos($cellAddress,'!') !== FALSE) {
 			list($sheetName,$cellAddress) = explode('!',$cellAddress);
+			$sheetName = trim($sheetName, "'");
 			$pSheet = $pCell->getParent()->getParent()->getSheetByName($sheetName);
 		} else {
 			$pSheet = $pCell->getParent();
 		}
 
-		return PHPExcel_Calculation::getInstance()->extractCellRange($cellAddress, $pSheet, False);
+		return PHPExcel_Calculation::getInstance()->extractCellRange($cellAddress, $pSheet, FALSE);
 	}	//	function INDIRECT()
 
 
@@ -373,9 +376,10 @@ class PHPExcel_Calculation_LookupRef {
 			return PHPExcel_Calculation_Functions::REF();
 		}
 
-		$sheetName = null;
+		$sheetName = NULL;
 		if (strpos($cellAddress,"!")) {
 			list($sheetName,$cellAddress) = explode("!",$cellAddress);
+			$sheetName = trim($sheetName, "'");
 		}
 		if (strpos($cellAddress,":")) {
 			list($startCell,$endCell) = explode(":",$cellAddress);
@@ -416,7 +420,7 @@ class PHPExcel_Calculation_LookupRef {
 			$cellAddress .= ':'.$endCellColumn.$endCellRow;
 		}
 
-		if ($sheetName !== null) {
+		if ($sheetName !== NULL) {
 			$pSheet = $pCell->getParent()->getParent()->getSheetByName($sheetName);
 		} else {
 			$pSheet = $pCell->getParent();