diff --git a/mybib.bib b/mybib.bib
index 401fda7..1eb0db2 100644
--- a/mybib.bib
+++ b/mybib.bib
@@ -5,6 +5,13 @@
 
 % $Id: mybib.bib,v 1.3 2009/11/28 20:05:52 robin Exp $
 
+@ARTICLE{canspec,
+  AUTHOR =       "Bosch.",
+  TITLE =        "CAN Specification 2.0",
+  JOURNAL =      "Bosch Technical Standard",
+  YEAR =         "1991"
+}
+
 @ARTICLE{caninauto,
   AUTHOR =       "H. Zeltwanger",
   TITLE =        "Single Processor implementation of the CANopen Safety Protocol",
@@ -20,6 +27,13 @@
 }
 
 
+@ARTICLE{crcembedd,
+  AUTHOR =       "Philip Koopman, Tridib Chakravarty",
+  TITLE =        "Cyclic Redundancy Code (CRC) Polynomial Selection for Embedded Networks",
+  JOURNAL =      "The International Conference on dependable systems and networks DSN-2004",
+  YEAR =         "2004"
+}
+
 @ARTICLE{nucfta,
   AUTHOR =       "US Nuclear reg commission",
   TITLE =        "Fault Tree Handbook",
diff --git a/statistics/statistics.tex b/statistics/statistics.tex
index a3895e4..92f692b 100644
--- a/statistics/statistics.tex
+++ b/statistics/statistics.tex
@@ -53,10 +53,11 @@ For the Nuclear power station
 
 \subsubsection{CANopen Timing Definitions}
 
-CANopen is a protocol suite based on the hardware of the CANbus\cite{canopen}.
-It is a hardened differential bus and 
-is arbitration free\footnote{Implemented at the physical and data link layers using DOMINANT and PASSIVE bits}
-It also has a 15 bit\cite{crc15} CRC built into the protocol, which can detect a guaranteed six consecutive bit failures.
+CANopen is a protocol suite based on the hardware of the CANbus\cite{canspec}.
+CANbus is a hardened differential serial communications bus and 
+is arbitration free\footnote{Implemented at the physical and data link layers using DOMINANT and PASSIVE bits, with self monitoring and auto back off
+form the node first transmitting a PASSIVE bit that is DOMINANT on the bus}
+It also has a 15 bit\cite{crcembedd} CRC built into the protocol, which can detect a guaranteed six consecutive bit failures.
 This makes it a very safe and robust messaging medium to use for safety critical systems.
 CAN is a message based protocol, designed originally for automotive applications but 
 now also used in other areas such as industrial automation, industrial burner controllers and medical equipment.