Bubley, Dean.  <br/><br/>
Opportunities for ISDN :   the Market for new Technologies and Services /   1 t. 
Bubley Dean. 
 - London :   FT Business Enterprises,   1994. 
 - VIII, 173 s.:   il.;   30 cm. 
<br/><br/><label>ISBN: </label>1853342297