@incollection{, 9511B45D9E1995CF00D0E6F7BD08DAD6 , author={{endookoo, gmail.com} and {Jimma University}}, journal={{Global Journal of Management and Business Research}}, journal={{GJMBR}}2249-45880975-585310.34257/GJMBR, address={Cambridge, United States}, publisher={Global Journals Organisation}1642736 } @book{b0, , title={{Tax and Tax reform in Ethiopia}} , author={{ GAlemayehu } and { SAbebe }} , year={2005. 1990-2003} UNU-WIDER. World institute for development economic research. United Nation University } @incollection{b1, , title={{Estimation of long-run coefficients in error correction models}} , author={{ GBardsen }} , journal={{Oxford Bulletin of Economics and Statistics}} 51 , year={1989} } @incollection{b2, , title={{Government Spending, Taxes and Economic Growth}} , author={{ PCashin }} , journal={{IMF Staff Paper}} 42 , year={1995. 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