GRYGORYAN, R.; LIABAKH, E. The substantiation of the point that essential . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 9, p. 116–122, 2025. DOI: 10.15407/dopovidi2014.09.116. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/16764. Acesso em: 18 apr. 2026.