SUKHOREBSKA, D. . Necessary condition for the existence of a simple closed geodesic on a regular tetrahedron in the spherical space . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 10, p. 9–14, 2024. DOI: 10.15407/dopovidi2020.10.009. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/2020-10-2. Acesso em: 20 apr. 2026.