diff --git a/Classes/PHPExcel/Calculation.php b/Classes/PHPExcel/Calculation.php
index 8fe6746..cfe72f1 100644
--- a/Classes/PHPExcel/Calculation.php
+++ b/Classes/PHPExcel/Calculation.php
@@ -3517,7 +3517,8 @@ class PHPExcel_Calculation {
 			// Extract range
 			$aReferences = PHPExcel_Cell::extractAllCellReferencesInRange($pRange);
 			$pRange = $pSheet->getTitle().'!'.$pRange;
-			if (count($aReferences) == 1) {
+			if (!isset($aReferences[1])) {
+				//	Single cell in range
 				list($currentCol,$currentRow) = sscanf($aReferences[0],'%[A-Z]%d');
 				if ($pSheet->cellExists($aReferences[0])) {
 					$returnValue[$currentRow][$currentCol] = $pSheet->getCell($aReferences[0])->getCalculatedValue($resetLog);
@@ -3525,7 +3526,7 @@ class PHPExcel_Calculation {
 					$returnValue[$currentRow][$currentCol] = null;
 				}
 			} else {
-				// Extract cell data
+				// Extract cell data for all cells in the range
 				foreach ($aReferences as $reference) {
 					// Extract range
 					list($currentCol,$currentRow) = sscanf($reference,'%[A-Z]%d');
@@ -3589,7 +3590,8 @@ class PHPExcel_Calculation {
 
 			// Extract range
 			$aReferences = PHPExcel_Cell::extractAllCellReferencesInRange($pRange);
-			if (count($aReferences) == 1) {
+			if (!isset($aReferences[1])) {
+				//	Single cell in range
 				list($currentCol,$currentRow) = PHPExcel_Cell::coordinateFromString($aReferences[0]);
 				if ($pSheet->cellExists($aReferences[0])) {
 					$returnValue[$currentRow][$currentCol] = $pSheet->getCell($aReferences[0])->getCalculatedValue($resetLog);
@@ -3597,7 +3599,7 @@ class PHPExcel_Calculation {
 					$returnValue[$currentRow][$currentCol] = null;
 				}
 			} else {
-				// Extract cell data
+				// Extract cell data for all cells in the range
 				foreach ($aReferences as $reference) {
 					// Extract range
 					list($currentCol,$currentRow) = PHPExcel_Cell::coordinateFromString($reference);
diff --git a/Classes/PHPExcel/Writer/Excel2007.php b/Classes/PHPExcel/Writer/Excel2007.php
index 9a9464a..55c90e1 100644
--- a/Classes/PHPExcel/Writer/Excel2007.php
+++ b/Classes/PHPExcel/Writer/Excel2007.php
@@ -172,7 +172,7 @@ class PHPExcel_Writer_Excel2007 implements PHPExcel_Writer_IWriter
 	 * @param 	string 	$pPartName		Writer part name
 	 * @return 	PHPExcel_Writer_Excel2007_WriterPart
 	 */
-	function getWriterPart($pPartName = '') {
+	public function getWriterPart($pPartName = '') {
 		if ($pPartName != '' && isset($this->_writerParts[strtolower($pPartName)])) {
 			return $this->_writerParts[strtolower($pPartName)];
 		} else {
@@ -363,7 +363,7 @@ class PHPExcel_Writer_Excel2007 implements PHPExcel_Writer_IWriter
 	 * @throws Exception
 	 */
 	public function getPHPExcel() {
-		if ($this->_spreadSheet !== NULL) {
+		if ($this->_spreadSheet !== null) {
 			return $this->_spreadSheet;
 		} else {
 			throw new Exception("No PHPExcel assigned.");
diff --git a/Classes/PHPExcel/Writer/Excel2007/Worksheet.php b/Classes/PHPExcel/Writer/Excel2007/Worksheet.php
index 24b3d71..7140fdc 100644
--- a/Classes/PHPExcel/Writer/Excel2007/Worksheet.php
+++ b/Classes/PHPExcel/Writer/Excel2007/Worksheet.php
@@ -858,7 +858,8 @@ class PHPExcel_Writer_Excel2007_Worksheet extends PHPExcel_Writer_Excel2007_Writ
 					$cellsByRow[$cellAddress[1]][] = $cellID;
 				}
 
-				for ($currentRow = 1; $currentRow <= $highestRow; ++$currentRow) {
+				$currentRow = 0;
+				while($currentRow++ < $highestRow) {
 					// Get row dimension
 					$rowDimension = $pSheet->getRowDimension($currentRow);