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Pirro, Andrea L. P.; Taggart, Paul (2021). “European populism before the pandemic: ideology, Euroscepticism, electoral performance, and government participation of 63 parties in 30 countries”. 《Italian Political Science Review/Rivista Italiana di Scienza Politica》 51 (3): 281–304. doi:10.1017/ipo.2021.13. ISSN0048-8402. S2CID234854028.
Pirro, Andrea L. P.; Taggart, Paul (2021). “European populism before the pandemic: ideology, Euroscepticism, electoral performance, and government participation of 63 parties in 30 countries”. 《Italian Political Science Review/Rivista Italiana di Scienza Politica》 51 (3): 281–304. doi:10.1017/ipo.2021.13. ISSN0048-8402. S2CID234854028.