Tkachenko, Victor. 2024. “Mykola Sumtsov’s Contribution to the Study of Pysankas”. V. N. Karazin Kharkiv National University Bulletin ‘History of Ukraine. Ukrainian Studies: Historical and Philosophical Sciences’ 38 (June), 159-67. https://doi.org/10.26565/2227-6505-2024-38-15.