Journal of research of the National Bureau of Standards :  1974 : Section A Physics and chemistry / 
United States. National Bureau of Standards. 
 - Washington, DC :   US Gov. Print. Off. 
 - v. 
<br/><br/><label>ISSN: </label>0022-4332 
<br/><br/><label>Subjects--Index Terms: </label>სტანდარტები პერიოდიკა 
<br/><br/><label>Universal Decimal Class. No.: </label>53(05)