Index: Zend/Amf/Parse/Amf3/Serializer.php
===================================================================
--- Zend/Amf/Parse/Amf3/Serializer.php	(revision 15124)
+++ Zend/Amf/Parse/Amf3/Serializer.php	(working copy)
@@ -35,6 +35,8 @@
  */
 class Zend_Amf_Parse_Amf3_Serializer extends Zend_Amf_Parse_Serializer
 {
+	private $_references = array();
+	
     /**
      * Serialize PHP types to AMF3 and write to stream
      *
@@ -220,6 +222,8 @@
      */
     public function writeArray(array $array)
     {
+    	$this->_references[] = $array;
+    	
         // have to seperate mixed from numberic keys.
         $numeric = array();
         $string  = array();
@@ -250,6 +254,22 @@
         return $this;
     }
 
+	public function writeReference($key)
+	{
+		$this->writeInteger($key << 1);
+	}
+
+	private function referenceExist($object)
+	{
+		$key = array_search($object, $this->_references, true);
+		if($key !== false) {
+			return $key;
+		} else { 
+			$this->_references[] = $object;
+			return false;
+		}
+	}
+
     /**
      * Write object to ouput stream
      *
@@ -258,6 +278,11 @@
      */
     public function writeObject($object)
     {
+    	if(($key = $this->referenceExist($object)) !== false) {
+    		 $this->writeReference($key); 
+    		 return $this;
+    	}
+    	
         $encoding  = Zend_Amf_Constants::ET_PROPLIST;
         $className = '';