Eberspacher, Jorg Vogel, Hans-Jorg <br/><br/>
Gsm  : switching, services and protocols 
/ Jorg Eberspacher, Hans-Jorg Vogel 
 - Chichester  John Wiley & Sons  1999 
 - vii, 273 p. 
<br/><br/><label>ISBN: </label>0-471-98278-4 
<br/><br/><label>Dewey Class. No.: </label>621.382  / EBE