Polish Captain Andrzej Okun’s Role in the Military Campaigns Against the Ukrainian Cossacks (1648 – beginning of the 50s of the ХVII century). HoUS [Internet]. 2016 Sep. 19 [cited 2026 Oct. 25];21:21-9. Available from: https://periodicals.karazin.ua/uahistory/article/view/6049