SRIBNYAK I. DOCTOR IVAN ZAITSEV’S ARCHIVAL INVESTIGATIVE CASE MATERIALS AS A SOURCE FOR STUDYING SOVIET LIFE OF THE MID-1930S IN THE UKRAINIAN SOCIALIST SOVIET REPUBLIC. gsipen [Internet]. 2023 Oct. 13 [cited 2024 Nov. 19];(1):48-59. Available from: http://gsip.wunu.edu.ua/index.php/gsipen/article/view/140