Olsza?ski, Tadeusz A., Jan Strzelecki, and Andrzej Wilk. "Kyiv refuses to make concessions to the separatist republics?" Center for Eastern Studies (OSW), Analyses (2015).

Wierzbowska-Miazga, Agata, and Tadeusz A. Olsza?ski. "The Consequences of the Annexation of Crimea." Center for Eastern Studies (OSW), Analyses (2014).