Levyk, Bogdan. “Stanislav Frize, a Researcher of Lviv Politekhnika, in Records of the People’s State Security Commissariat for January-August 1945”. Skhid, no. 5(151) (December 6, 2017). Accessed July 1, 2022. http://skhid.kubg.edu.ua/article/view/117297.