SAVANETS, Liudmyla; POPERECHNA, Hanna. The doctrine of hardship in contract law: comparative study. Актуальні проблеми правознавства, [S. l.], n. 2, p. 126–134, 2022. Disponível em: https://appj.wunu.edu.ua/index.php/appj/article/view/1391. Acesso em: 13 jul. 2025.