Nazar Zatorskyy 2017. THE EMBASSY TO THE POPE SIXTUS IV WITH THE EPISTLE OF MISAEL IN THE LIGHT OF SOME DOCUMENTS FROM THE VATICAN SECRET ARCHIVES. International Relations of Ukraine: Scientific Searches and Findings. 26 (Nov. 2017), 11–30. DOI:https://doi.org/10.15407/mzu2017.26.011.