M. Voloshchuk, “On the eve of capturing Halych by Mstislav Mstislavich (late March – early April 1221): a prosopography of the participants in the battle”, in Before the Battle, vol. 7, T. Grabarczyk and M. Pogońska-Pol, Eds. Poland: Lodz University Press, 2023, pp. 41–93. doi: 10.18778/8331-303-0.03.