R.J.Deasington <br/><br/>
X.25 explained:protocols for packet switching networks 

 - 
 -  John Wiley and Sons  1986 
 - 131 
<br/><br/>  
<br/><br/><label>ISBN: </label>0-470-20731-0 
<br/><br/><label>Dewey Class. No.: </label>004.72.