1. Arató, K. & Koller, B. (2018) ‘Hungary in the Visegrád Group: Introducing a Three-Level Game Approach’, in Schweiger, C. & Visvizi, A. (eds).
2. Aslund, A. & Fehlinger, G. (2017) ‘Ukraine Should Join Central Europe Trade Club’, EU Observer, 29 September, available at: https://euobserver.com/opinion/139205, accessed 8 April 2021.
3. On The Edge
4. Beleskov, M. (2017) ‘Yevropeys’kyi oboronnyi soyuz: navishcho YeS znovu hovoryt pro spinu armiyu’, Yevropeyska pravda, 27 February, available at: https://www.eurointegration.com.ua/articles/2017/02/27/7062233/, accessed 7 April 2021.
5. Bornio, J. (2020) ‘Lithuania, Poland and Ukraine Inaugurate “Lublin Triangle”’, Eurasia Daily Monitor, 17, 115, available at: https://jamestown.org/program/lithuania-poland-and-ukraine-inaugurate-lublin-triangle/, accessed 7 April 2021.