Sayenko, YurijSelivanov, VasilijSelivanov, Evgenij2018-10-312018-10-3119941022-80122592-818Xhttp://hdl.handle.net/123456789/178enAttribution-NonCommercial 4.0 Internationalhttp://creativecommons.org/licenses/by-nc/4.0/Pirogov StudiesPirogova studijasArticle10.25143/amhr.1994.II.04