GRUSHKA, Y. Necessary and sufficient condition for the existence of the one-point time on an oriented set . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 8, p. 9–15, 2024. DOI: 10.15407/dopovidi2019.08.009. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/2213. Acesso em: 2 nov. 2024.