Ivanova Karina Andriivna, Khirina Anna Oleksandrivna, and Balabay Yana Volodymyrivna, “THE CONTRIBUTION OF MYKOLA SUMTZOV IN THE STUDY OF ALEXANDR PUSHKIN LEGACY (BASED ON KHARKIV MATERIALS)”, RS Global - World Science, vol. 3, no. 5(57), pp. 20-24, May 2020.