Grosfeld, E., Scheepers, D., Cuyvers, A. and Ellemers, N. 2022. The Integration of Subgroups at the Supranational Level: The Relation Between Social Identity, National Threat, and Perceived Legitimacy of the EU. Journal of Social and Political Psychology. 10, 2 (Oct. 2022), 607-623. DOI:https://doi.org/10.5964/jspp.7917.