I.S.O. <br/><br/>
ISO/IEC Guide: 43-1-1997: Profiency Testing by Inter Laboratory Comparisons.Part 1. 

 - 2nd ed. 
 - Geneva  ISO 
 - 1-16 
<br/><br/> received from ERC Tnp 
<br/><br/><label>Universal Decimal Class. No.: </label> /