RT Journal Article A1 OECD T1 Belgium JF Quarterly National Accounts YR 2012 FD Apr 16 VO 2011 IS 4 AB PB Organisation for Economic Co-operation and Development SN 2219-5106 DO 10.1787/qna-v2011-4-4-en UL http://www.oecd-ilibrary.org/;jsessionid=ms4ge5kjvlmu.x-oecd-live-02content/article/qna-v2011-4-4-en