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Economics Letters > 1997 > 57 > 3 > 245-253
Economics Letters > 1996 > 50 > 3 > 315-321
Journal of Econometrics > 1995 > 66 > 1-2 > 153-173
Economics Letters > 1997 > 57 > 3 > 245-253
Economics Letters > 1996 > 50 > 3 > 315-321
Journal of Econometrics > 1995 > 66 > 1-2 > 153-173