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Economics Letters > 2004 > 84 > 3 > 433-439
Economics Letters > 2002 > 76 > 3 > 383-391
Economics Letters > 2001 > 71 > 1 > 27-33
Economics Letters > 2004 > 84 > 3 > 433-439
Economics Letters > 2002 > 76 > 3 > 383-391
Economics Letters > 2001 > 71 > 1 > 27-33