Bell system technical journal 

 - New York, N.Y. :  American Telephone and Telegraph (AT&T), 
 - Desconocida 
<br/><br/><label>ISSN: </label>0005-8580 
 = Bell system technical journal 
 = Bell Syst. Tech. J. 
<br/><br/><label>Subjects--Index Terms: </label>ELECTRONICA