diff --git a/gulliver/system/class.g.php b/gulliver/system/class.g.php
index e07d8e4f2..a2a709fef 100755
--- a/gulliver/system/class.g.php
+++ b/gulliver/system/class.g.php
@@ -2296,7 +2296,7 @@ class G
      * @param string $sText
      * @return string strtolower($sText)
      */
-    public function toLower ($sText)
+    public static function toLower ($sText)
     {
         return strtolower( $sText );
     }
@@ -5260,12 +5260,12 @@ class G
      * @param type $pathData
      * @param type $file
      */
-    public function log($message, $pathData = PATH_DATA, $file = 'cron.log')
+    public static function log($message, $pathData = PATH_DATA, $file = 'cron.log')
     {
         $config = System::getSystemConfiguration();
         G::LoadSystem('logger');
 
-        $oLogger =& Logger::getSingleton($pathData, PATH_SEP, $file);
+        $oLogger = Logger::getSingleton($pathData, PATH_SEP, $file);
         $oLogger->limitFile = $config['number_log_file'];
         $oLogger->limitSize = $config['size_log_file'];
         $oLogger->write($message);
diff --git a/gulliver/system/class.logger.php b/gulliver/system/class.logger.php
index c107dd71d..080c62b93 100644
--- a/gulliver/system/class.logger.php
+++ b/gulliver/system/class.logger.php
@@ -46,7 +46,7 @@ class Logger
         $this->filePath = $this->path . $this->fullName;
     }
 
-    public function getSingleton($pathData, $pathSep, $file = 'cron.log')
+    public static function getSingleton($pathData, $pathSep, $file = 'cron.log')
     {
         if (self::$instance == null) {
             self::$instance = new Logger($pathData, $pathSep, $file);
diff --git a/workflow/engine/classes/class.pmLicenseManager.php b/workflow/engine/classes/class.pmLicenseManager.php
index ace704336..a92aec915 100644
--- a/workflow/engine/classes/class.pmLicenseManager.php
+++ b/workflow/engine/classes/class.pmLicenseManager.php
@@ -19,7 +19,7 @@ class pmLicenseManager
         //to do: this files probably needs to be in core, since they are GPL2
         //include_once (PATH_PLUGINS . 'enterprise' . PATH_SEP . 'classes' . PATH_SEP . 'class.license.lib.php');
         //include_once (PATH_PLUGINS . 'enterprise' . PATH_SEP . 'classes' . PATH_SEP . 'class.license.app.php');
-        
+
         require_once PATH_CORE . 'classes' . PATH_SEP . 'class.license.lib.php';
         require_once PATH_CORE . 'classes' . PATH_SEP . 'class.license.app.php';
 
@@ -113,7 +113,7 @@ class pmLicenseManager
         $this->activateFeatures ();
     }
 
-    public function &getSingleton()
+    public static function getSingleton()
     {
         if (self::$instance == null) {
             self::$instance = new pmLicenseManager ();