Keiser, Bernhard,  1928- <br/><br/>
Digital telephony and network integration / 
Bernhard E. Keiser and Eugene Strange. 
 - New York :  Van Nostrand Reinhold Co.,  c1985. 
 - xvii, 451 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0442246595 
<br/><br/><label>LCCN: </label>83021698  
<br/><br/><label>LC Class. No.: </label>TK6421  / .K45 1985 
<br/><br/><label>Dewey Class. No.: </label>621.385