1. Akimov, Yu. G. (2016). Paradiplomacy as a means of expressing the regional identity of the subjects of federations. Managerial consulting, 2 (86): 25—33. (In Russ.).
2. Arteev, S., Kentros Klyszcz, I. U. (2021). From Decentralization to Coordination: The Evolution of Russian Paradiplomacy (1991—2021). Problems of Post-Communism, 1: 1—12. DOI: 10.1080/10758216.2021.2009350.
3. Bazarenko, T. V. (2014). Foreign policy activity of autonomous communities of Spain in the context of the concept of “Europe of Regions”. PhD Diss. Moscow. 238 p. (In Russ.).
4. Caminals-Heath, R. (2017). Cultural Identity: The Catalan Referendum. In: Cultural Identity: the Catalan Referendum. Fairfax, VA: George Mason University. 9 p.
5. Dronova, S. Yu. (2020). Modern relations between the central and regional authorities of Spain: problems and mechanisms of regulation. PhD Diss. Moscow. 189 p.