Kocherhin, Ihor. " The Leonovs noble family in the history of Yekaterinoslav region" Universum Historiae et Archeologiae = The Universe of History and Archeology = Універсум історії та археології = Универсум истории и археологии ISSN 2664-9950 (Print) ISSN 2707-6385 (Online) [Online], Volume 3 Number 2 (29 December 2020)