Butov, Ilya S. 2020. “Evidence of Unidentified «aeroplanes» in Viciebsk Guberniya in 1914–1915: A Look through the Prism of the Era”. Journal of the Belarusian State University. History, no. 3 (July): 23-33. https://doi.org/10.33581/2520-6338-2020-3-23-33.