NGUYEN, Thi Hoai Uyen. Useful methods for solving functional equations. Dong Thap University Journal of Science, [S. l.], n. 17, p. 113–115, 2015. DOI: 10.52714/dthu.17.12.2015.303. Disponível em: https://dthujs.vn/index.php/dthujs/article/view/975. Acesso em: 20 apr. 2025.