1. Methods changes during the COVID-19 period,2020
2. Circulant singular spectrum analysis: A new automated procedure for signal extraction;Bógalo;Signal Process.,2021
3. Time Series Analysis by State Space Methods;Durbin,2012
4. Guidance on treatment of COVID-19-CRISIS effects on data,2020
5. Programs TRAMO and SEATS: Instructions for the User;Gómez,1996