IVANOV, B. Enclosure structures of equal level line fields in the gradient filling problem. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie), [S. l.], v. 7, n. 8, p. 30–40, 2006. Disponível em: https://en.num-meth.ru/index.php/journal/article/view/228. Acesso em: 27 apr. 2024.