RT Book, Section SR Electronic(1) A1 United Nations YR 2012 T1 Conversion coefficients and factors T2 Monthly Bulletin of Statistics, May 2012 PB United Nations SN 9789210551915 DO 10.18356/d7ac79b4-en-fr UL https://www.un-ilibrary.org/content/books/9789210551915s013-c002