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Economics Letters > 2004 > 84 > 3 > 433-439
Journal of Macroeconomics > 2004 > 26 > 1 > 131-145
Journal of Econometrics > 2004 > 119 > 1 > 45-71
Economics Letters > 2000 > 68 > 1 > 7-11
Economics Letters > 1999 > 63 > 3 > 279-283