IS: 1885 (part 73/Sec 1) - 1993/IEC Pub. 0050 (111-01) - 1982; Electrotechnical vocabulary Part 73 Physics and chemistry Section 1 Physical concepts 

 - New Delhi  BIS  1993 
 - 7p 
<br/><br/><label>Universal Decimal Class. No.: </label> /