SEOUL (Reuters) - The world economy is slowing down due to a combination of factors such as the euro zone's debt problems and a weak U.S. housing sector, but it is not headed for a double-dip slump, the head of the OECD said on Monday. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=6G_kqHhw9Ik:HFH19SSYpOM:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=6G_kqHhw9Ik:HFH19SSYpOM:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/6G_kqHhw9Ik)