4Obas John Ebohon. Energy, economic growth and causality in developing countries. Energy Pofiey, 2996, 24 (5) :447 - 453.
5Ugur Soytas, Bamm,an Sari. Energy consumption and GDP: causality relationship in G-7 countries and emerging markets. Energy Economics, 2003, (25) : 33 ~ 37.
