NIKITINA, N. The principle of symmetry in three-dimensional systems . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 7, p. 21–28, 2024. DOI: 10.15407/dopovidi2017.07.021. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/7675. Acesso em: 23 dec. 2024.