DARMA, I. K.; KARMA, . I. G. M.; SANTIANA, I. M. A. Practicality and effectiveness of digital mathematics teaching materials in improving the problem-solving ability for polytechnic students. International research journal of engineering, IT & scientific research, [S. l.], v. 7, n. 6, p. 203–213, 2021. DOI: 10.21744/irjeis.v7n6.1935. Disponível em: https://sloap.org/journals/index.php/irjeis/article/view/1935. Acesso em: 16 jul. 2024.