Hargrave, Andrew Rebeiro Sole, David Viamonte <br/><br/>
Multimedia Group Communication   Push-to-Talk over Cellular, Presence and List Management Concepts and Applications 

 - Chichester  John Wiley  2008 
 - xxi+275p.,26x12Cms. 
<br/><br/><label>ISBN: </label>9780470058534 
<br/><br/><label>Dewey Class. No.: </label>621.38456 R286