The impact of COVID-19 on life expectancy in Ukraine in 2022–2023. Mathematical Machines and Systems, [S. l.], n. 3-4, p. 93–99, 2024. DOI: 10.34121/1028-9763-2024-3-4-93-99. Disponível em: https://j-mms.de/index.php/mms/article/view/2024-3-4-a6. Acesso em: 20 sep. 2026.