(1)
Siman, M. Equality Through Differentiation: Opt-Outs and Enhanced Cooperation As Expressions of Sovereignty. In Unequal Equals? The Status of Member States in an Integrating European Union; Sehnálek, D., Ed.; Studies of the Central European Professors’ Network: Miskolc–Budapest, 2026; pp. 235–277. https://doi.org/10.54237/profnet.2026.dsuesmsieu_7.