LEWANDOWSKI, Włodzimierz; MARSZALEC, Michał. A Brief History of UTC Leap Second. Journal of Telecommunications and Information Technology, [S. l.], v. 94, n. 4, p. 117–122, 2023. DOI: 10.26636/jtit.2023.4.1486. Disponível em: https://www.jtit.pl/jtit/article/view/1486. Acesso em: 26 apr. 2026.