Quarterman, John S.,  1954- <br/><br/>
The Matrix  computer networks and conferencing systems worldwide 
John S. Quaterman 
 - Bedford, Mass.  Digital Press  1990 
 - 719 p. : ill. ; 26 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>1555580335 
<br/><br/><label>LCCN: </label>89-1392 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks<br/>Telecommunication<br/>Computer conferencing