Kessler Gary C Au. <br/><br/>
ISDN    Concepts , facilities and services      

 - 2 
 -  1993 
<br/><br/><label>Standard No.: </label>8011 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>D6,8(B),277, N3