GILL, R. . Universally Symmetric Hulls and Problems in Real Calculus. International Journal on Recent Trends in Life Science and Mathematics, [S. l.], v. 8, n. 3, p. 29–36, 2021. Disponível em: https://www.ijlsm.org/index.php/ijlsm/article/view/156. Acesso em: 25 sep. 2023.