PHAM, T. B. H.; DANG, T. K. Ensure Results of Queries to Service Provider’s Databases. Journal of Technical Education Science, [S. l.], v. 4, n. 1, p. 18–29, 2009. Disponível em: https://www.jte.edu.vn/index.php/jte/article/view/901. Acesso em: 7 apr. 2026.