[PATCH 2/2] Fix S390 normative references.

As pointed out in TAB-539 and TAB-540:

- Add an URL to the documents. (Unfortunately, there is no link that
  always points to the latest version.)
- State that we include any future revisions as well.

Signed-off-by: Cornelia Huck <>
---
 introduction.tex |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/introduction.tex b/introduction.tex
index 2830f30..313e30f 100644
--- a/introduction.tex
+++ b/introduction.tex
@@ -40,8 +40,8 @@ The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "S
 
 \begin{longtable}{l p{5in}}
 	\phantomsection\label{intro:rfc2119}\textbf{[RFC2119]} & S. Bradner, Key words for use in RFCs to Indicate Requirement Levels, \newline\url{http://www.ietf.org/rfc/rfc2119.txt}, March 1997\\
-	\phantomsection\label{intro:S390 PoP}\textbf{[S390 PoP]} & z/Architecture Principles of Operation, \newline IBM Publication SA22-7832\\
-	\phantomsection\label{intro:S390 Common I/O}\textbf{[S390 Common I/O]} & ESA/390 Common I/O-Device and Self-Description, \newline IBM Publication SA22-7204\\
+	\phantomsection\label{intro:S390 PoP}\textbf{[S390 PoP]} & z/Architecture Principles of Operation, IBM Publication SA22-7832, \newline\url{http://publibfi.boulder.ibm.com/epubs/pdf/dz9zr009.pdf}, and any future revisions\\
+	\phantomsection\label{intro:S390 Common I/O}\textbf{[S390 Common I/O]} & ESA/390 Common I/O-Device and Self-Description, IBM Publication SA22-7204, \newline\url{http://publibfp.dhe.ibm.com/cgi-bin/bookmgr/BOOKS/dz9ar501/CCONTENTS}, and any future revisions\\
 \end{longtable}
 
 \section{Structure Specifications}
-- 
1.7.9.5