Akçomak, İ. Semih, [MERIT, Maastrciht University, Maastricht, The Netherlands] and Erol Taymaz [Department of Economics, Middle East Technical University, Ankara, Turkey] 

ERC [Economic Research Center; Middle East Technical University, Turkey] Working Papers in Economics 04/12, October 2004. This paper derives from the master thesis of the first author submitted to Middle East Technical University (METU), Ankara in July 2003. 

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