Темчин Сергей Юрьевич. “Poland, Ruthenia and Lithuania As the Holy Trinity: A Medieval Prehistory of the Poetic Image by Platon Kostec’kyj (1861)”. Slavistica Vilnensis 620 (October 26, 2018): 265-276. Accessed September 22, 2021. https://www.journals.vu.lt/slavistica-vilnensis/article/view/12046.