Metropolitan area networks:  Concepts, standards and services/  English. 
Gary C. Kessler, David A. Train. 
 - America:  McGraw-Hill inc,  1992. 
 - xii, 436p.:  ill.;  24cm. 
<br/><br/><label>ISBN: </label>0070342431 
<br/><br/><label>Dewey Class. No.: </label>681.141.3  / KES