B. Chmelʹnycʹkyj vs M. Kryvonis supernyctvo za bulavu čy konfrontacija pohljadiv na charakter i metu revoljucijnoï borotʹby 1648 r.? = B. Khmelnytskyi vs M. Kryvonis : rivalry for the bulava or confrontation of viewpoints on the nature and purpose of the revolutionary struggle of 1648? - Stepankov, Valerij Stepanovyč 1947-; Stepankov, Vitalij Valerijovyč (2023)