PRYMAK, Volodymyr. Change and Termination of Obligation in Conditions of the COVID-19 Pandemic. University Scientific Notes, [S. l.], n. 2 (80), p. 48–61, 2021. DOI: 10.37491/UNZ.80.5. Disponível em: https://www.unz.univer.km.ua/index.php/unz/article/view/80_48-61. Acesso em: 14 mar. 2026.