eng National Academy of Sciences of Ukraine, Institute of Encyclopedic Research The Encyclopedia Herald of Ukraine 2706-9990 2707-000X 2014-12-16 4-5 98 101 10.37068/evu.4-5.11 article Oleh Savchenko https://orcid.org/0000-0003-1298-154X https://evu.encyclopedia.kyiv.ua/article/26