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1. CANOVA，F.and HASEN,B.E.(1995) Are Seasonal patterns constant over time? A test for Seasonal stability. Journal of Buiness and economic Statistics,13(3)L237-252 2. DICKEY,D.A.and HASZA,D.P.and FULLER,W.A.(1984)Testing for unit roots in seasonal time series.Journal of the American Statistical Association,79(386):355 367

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