ВАВЖЕНЧУК, С. Я. The eesence and methods of classification of contracts. Problems of legality, [S. l.], n. 147, p. 58–65, 2019. DOI: 10.21564/2414-990x.147.185005. Disponível em: http://plaw.nlu.edu.ua/article/view/185005. Acesso em: 6 apr. 2025.