DAO, Tam; LAM, Van Hieu. Some methods of developing new problems from those in mathematics textbooks 4-5. Dong Thap University Journal of Science, [S. l.], n. 18, p. 19–24, 2016. DOI: 10.52714/dthu.18.2.2016.308. Disponível em: https://dthujs.vn/index.php/dthujs/article/view/932. Acesso em: 19 sep. 2024.