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Is seasonal adjustment a linear or nonlinear data filtering process?
Ghysels, Eric, (1995)
Ein empirischer Vergleich neuerer Verfahren zur Saisonbereinigung und Komponentenzerlegung
Höpfner, Birgit, (1998)
Estimation error and the specification of unobserved component models
Maravall Herrero, Agustín, (1999)
Impulse response functions for periodic integration
Breitung, Jörg, (1997)
Quarterly US unemployment : cycles, seasons and asymmetries
Franses, Philip Hans, (1993)
Testing for common trends across periodically integrated seasonal time series