1. Anderson, C. J. (1998): When in Doubt, Use Proxies: Attitudes toward Domestic Politics and Support for European Integration. Comparative Political Studies 31(5): 569–601, available at https://doi.org/10.1177/0010414098031005002.
2. ARDECO (2023a): GDP in PPS [dataset]: available at https://urban.jrc.ec.europa.eu/trends?lng=en&ctx=ardeco&ts=ARDECO&pil=indicator-le-vel&is=ARDECO&cl=default&i=92&tl=3&clc=002-economy&db=513&it=download&cwt=line-chart&y=2022&tv=-1.
3. ARDECO (2023b): GDP per capita in PPS [dataset]: available at https://urban.jrc.ec.europa.eu/trends?lng=en&ctx=ardeco&ts=ARDECO&pil=indicator-le-vel&is=ARDECO&cl=default&i=91&tl=3&clc=002-economy&tv=2016&db=658&it=down-load&y=2008&cwt=line-chart.
4. ARDECO (2023c). Total Popilation (on 1st January) [dataset]: available at https://urban.jrc.ec.europa.eu/trends?lng=en&ctx=ardeco&ts=ARDECO&pil=indicator-le-vel&is=ARDECO&cl=default&i=66&tl=3&clc=001-population-dynamics&db=509&it=download&tv=-1&cwt=line--chart&y=2022.
5. Bakker, R. – Hooghe, L. – Jolly, S. – Marks, G. – Polk, J. – Rovny, J. – Steenbergen, M. – Vachudova, M. (2020): Codebook 2019 Chapel Hill Expert Survey: May 2020 Version 2019.3: available at https://www.chesdata.eu/2019-chapel-hill-expert-survey.