Annual Report 93: Institute for reference materials and measurements IRMM. 

 - Brussels :  Commission of the European Communities,  1994. 
 - 142 p. 
<br/><br/><label>ISBN: </label>9282680029 
<br/><br/><label>ISSN: </label>02535270 
<br/><br/><label>Standard No.: </label>EUR15659 EN