ГРЕБЕНЮК, М. Ф. Dual normalization of the tangentially degenerate surface. Proceedings of National Aviation University, [S. l.], v. 12, n. 1, p. 227–232, 2002. DOI: 10.18372/2306-1472.12.13629. Disponível em: https://jrnl.nau.edu.ua/index.php/visnik/article/view/13629. Acesso em: 3 may. 2024.