БУЙВОЛ, В. The concept of hypothetical flows. Proceedings of National Aviation University, [S. l.], v. 19, n. 1, p. 176–179, 2004. DOI: 10.18372/2306-1472.19.991. Disponível em: https://jrnl.nau.edu.ua/index.php/visnik/article/view/991. Acesso em: 4 may. 2024.